In dynamic and changing contexts such as the one under study, information obligations are a growing phenomenon. The purpose of such obligations is not only for the administration to exercise control over those obliged to provide information, but also to dissuade and prevent evasive conduct. This preventive nuance increases exponentially when the person providing information has to do so, not only with his data but also with that of others. The phenomenon of the collaborative economy poses new challenges and questions, as there is certain deregulation and informality of the relationships that have been causing misgivings both in the Administrations and in the regulated tourist accommodation sector. Thus, we must now delve into the fact that this situation has caused mistrust - in addition, of course, to the serious social and environmental impacts on our cities - which has led the Administration, firstly, to establish collaboration agreements with the different platforms and, secondly, to establish information obligations for the most important players in this phenomenon: the collaborative platforms. Thus, the intermediary, the collaborative platform, becomes the central figure both in terms of the negotiating power it possesses and the wealth of information it manages. All this leads us to question not only the role or position of digital platforms but also the determination of their responsibilities in terms of fraud prevention. The pressure from local councils is mainly due to the need to plan tourism activity in the long term, as they need to know exactly how many dwellings of this type are on the market to set limits on their expansion and length of stay. For this reason, there are Autonomous Communities that set maximum rental periods per dwelling, as part of packages of measures that include the prohibition of opening new businesses for tourism in certain neighborhoods -generally those in the center. The problem is not tourism but the volume of visitors. Possession of this information is vital to monitor - and ensure - that sustainability thresholds set by regional and local regulations are not exceeded. To achieve this, the first step was that the platforms could not have anonymous hosts, and
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