This chapter critically investigates the concept of data-opolies—a term coined by Maurice Stucke to describe the monopolistic control over data by dominant tech corporations such as Google, Apple, Facebook, Amazon, and Microsoft (GAFAM). It explores how this concentration of data power threatens democratic resilience, distorts competition, and exacerbates socio-political inequalities. Drawing from Echeverría’s Telepolis, Cancela’s Utopías Digitales, and Lehdonvirta’s Cloud Empires, the chapter unpacks the network effects that entrench data-opolies and their capacity to manipulate user behavior, public opinion, and market dynamics. The chapter contends that these monopolistic structures erode democratic accountability and civic trust by fostering opaque algorithmic governance and undermining citizen agency. In response, it proposes emancipatory datafication strategies, including data cooperatives, algorithmic transparency, and participatory infrastructures, aimed at reclaiming democratic control over digital systems. Special attention is given to the sociopolitical implications of digital nomadism and e-diasporas as new global patterns of democratic interaction. Finally, the chapter offers a visionary assessment of Web3 technologies—blockchain, DAOs, and data cooperatives—as a potential counterweight to data-opolies. By advancing transparency and user agency, Web3 is presented as a foundation for inclusive, decentralized, and empowered digital democracies fit for the algorithmic age.