What does it mean to be a ‘smart citizen’ today, when urbanisation itself seems to be made sense of and driven through the algorithmic intermediation of platforms ecosystems? In the paper, I discuss recent theorisations such as ‘platform urbanisation’ unpacking two concurrent trajectories: while software has been slipping into everyday life of citizens typically through mobile apps, the corporativisation of the Internet and the neoliberalisation process of city living have determined the subsumption of the very product of such exchanges, that is data, to acquire the role of commodity. The result has been the normalisation of software relations within a neoliberal framework, to the extent that platform urbanisation is having profound effects on citizenship itself – now a multiple concept expressed through the occurrences of digitally mediated encounters. In this paper, I discuss the first findings of a comparative study around the platform for collaborative governance Decidim as this has been deployed in successful Participatory Budget consultations in Brazil, NYC and Barcelona. Decidim scores high on the Scaffold of Smart Citizen Participation (Cardullo & Kitchin 2019a), but can these efforts be replicated? The 500 instances of Decidim worldwide are a consistent effort in producing collaborative forms of governance alternative to datafication, or are these just ethics-washing and tokenistic tactics? The conclusion I draw is that, despite being ubiquitous assemblages of technology and people, platform urbanisation does not happen by default or symbiotic spreading only. Instead, we need to remain wary of the underlining conditions through which platform urbanisation might evolve in a constant effort of provincialising digital technologies.