Shared-mobility service companies, including Uber, offer innovative and cheaper transport alternatives by reducing the marginal cost of service provision. These platforms are developing dynamically, offering a variety of services to meet diverse needs. Uber offers prearranged and on-demand transportation services in which drivers and passengers connect via digital applications, which are typically used for booking, electronic payment and ratings. Uber is included among the digital platforms related to MaaS. They enhance changes in social behavior in the market, which can be defined as transformations in the consumption model, i.e., moving from owning towards sharing [14,15], although as emphasized by Barbu et al. [16], neither of these consumption patterns are going to fade away. In their opinion, they will continue to coexist, expanding the range of the available consumer options. From the perspective of a user, SMS are developing very dynamically primarily due to: the application availability and its many functions (e.g., new user data verification process through the application), user safety (monitoring drivers’ driving and the control of trips made), user data security, payment data security and mobile application use security [17]. The research addressing SE is dominated by the studies covering accommodation and transportation services, where the authors’ attention is mainly focused on Airbnb and Uber platforms.

The source literature on Uber provides analyses of the business model and factors behind its market success [18]. A frequently addressed research problem is the effect of introducing Uber to urban transport systems in different cities [19,20,21,22,23], taking into account the environmental impacts [24,25,26,27] and also the employment factor [28]. Much attention is paid to the issues of policy towards Uber and the regulations underlying its activities [29,30,31].

The motives are described in literature through the prism of many theories, the earlier ones such as, e.g., Maslow’s Hierarchy of Needs or Herzberg’s Motivation theory as well as the contemporary theories of motivation (e.g., Expectancy theory) [32], Acquier et al. [33] and Möhlmann [34], who proposed a division into external and internal motives, and Dann [35], who conducted a decomposition of push and pull motives. The theory of push and pull motivations is often used in the studies on motivation in tourism. People travel because they are propelled by the psyche (push) and drawn by external forces (pull) [36,37]. As Hossain [38] states, motivation stands for an essential issue when it comes to the success of SE initiatives, hence the motives represent an important problem in research where the authors’ attention is focused both on the service providers and customers. Additionally, consumers’ motives are identified in terms of users—non-users and, as shown by Hawlitschek et al. [39], non-users’ motives are analyzed much less frequently. Most of the studies cover the accommodation sector. According to the analyses by Böcker and Meelen [40] and Hossain [38], there are gaps in the research on the motives followed by those using car sharing services and, as emphasized by Sung et al. [41], few of them discuss the motivations related to using platforms from the consumer’s perspective. At this point, it is important to highlight the significance of focusing on the motives in various SE sectors, because as the research findings by Böcker and Meelen [40] show, they remain diversified depending on the analyzed field. According to these authors, SE should not be approached as one coherent phenomenon.

Sustainable development has been identified as one of the greatest contemporary challenges. Based on the review of the previously published papers on sharing economy, Ranjbari et al. [42] stated that sustainability is an important concept applied in research. According to the authors, shared mobility offers great opportunities for supporting sustainable development [23]. In the opinion of many researchers, sharing the unused resources contributes to the efficiency improvement of their use. In other words, SMS should result in both economic (additional revenues and savings), social (access to services, convenience, additional functionalities) and environmental benefits (reduction in energy consumption, greenhouse gas emissions, PM2.5 pollution and traffic congestion and noise) [1,3,43,44,45,46,47]. However, there is evidence that this positive impact of sharing on sustainability is not an unequivocal one [47]. Barnes et al. [45] indicate that the effect of reducing PM2.5 emissions may be temporary. The researchers analyzing one selected first-order effect usually resulting in findings confirming the positive impact of car sharing on the environment, society or economy [43,48,49,50]. In turn, those who perceive the problem in a broader perspective (second-order effects) are highly skeptical about this positive influence, e.g., Jung and Koo [47]. According to Codagnone et al. [51], in practice it has neither been sufficiently transparent nor reliably documented. Demonstrating the net impact in terms of environmental sustainability at an aggregated level is extremely difficult and complex [52]. As some researchers claim, the problem of economic effects of SE development as well as social and environmental issues should still remain the subject of scientific studies [53,54].