Centralization was always inevitable with scale. New users aren't going to spend the same amount of time and brainpower managing their internet presence as OGs

Centralization was always inevitable with scale. New users aren't going to spend the same amount of time and brainpower managing their internet presence as OGs do/have. So they will choose the services that enable them to reduce the overhead of using the internet. For many, this doesn't just mean using Reddit for their interest-based communities, but using Gmail for spam prevention, Apple products for their curated store, Steam for ease of access, etc. This would only be solvable if you had government-forced interop so that e.g. Twitter posts were accessible on Mastodon timelines with no cost to the site operators, but even then any small barrier is something for a platform to optimize and sell in the form of a subscription/using their user base for ads.