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Why the Fediverse is not (yet) Billionaire-Proof, or: The 51% Attack for the Fediverse
(fungiverse.wordpress.com)
This is a most excellent place for technology news and articles.
Good writeup, but I don't see the Fediverse as a single entity--if a single instance gets to 51%, and even 25% of the other instances fork and continue federating among themselves, then those 25% would function just as well, and likely maintain users with shared interests (i.e. how Lemmy is still interesting despite being much smaller than Reddit)