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Decentralization fights that centralization creep, but only if we treat it like a long-term investment—consistent, patient, and not chasing shiny upgrades. Web3's real compound interest is in user ownership over time

That's right. Decentralization is a long-term investment, by default. Once the average Internet user finds out they can own their content and their data, they won't need Facebook and Twitter/X anymore. But that won't happen overnight.

What has web2 platforms replaces?

Facebook took over where MySpace left off. MySpace and Friendster replaced Six Degrees. Before that, forums replaced BBS boards.

Web2 is essentially one long timeline of platforms launching and dying, with new platforms filling the gap left behind by those before it. https://en.wikipedia.org/wiki/Timeline_of_social_media