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They may not have real federation, but they do some things well
(i.imgflip.com)
Memes about the Fediverse
It's not even theoretical. Reddit implemented this and the exact behaviour you described happened. Somebody tested and documented it.
https://www.reddit.com/r/TheoryOfReddit/comments/sdcsx3/testing_reddits_new_block_feature_and_its_effects/
I've had multiple occasions where someone on reddit was losing a debate against me and just blocked me, making it impossible to reply and giving them the "last word" to everyone else that can still see the entire comment chain.
This is not how a public forum like Reddit or Lemmy should behave. It makes sense on actual social media platforms like Instagram, but not here