this post was submitted on 04 Jul 2023
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You Should Know
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AFAIK, the ActivityPub specification has no requirements on how likes should be stored. The two things that is requires are that likes are added to the user's liked collection, and that the post's like count is updated.
Mastodon actually just stores all this data on the server containing the post itself. Instance admins get as much information about the post as the client does. Both Lemmy and Mastodon use the same protocol, but Mastodon chooses to only to trust the server the user is using, and not the third-party servers.
Creating that many users wouldn't be hard to do(you don't need to use the GUI, just a little SQL is all that's needed). And you don't need to "send" the upvotes; you can sidestep the protocol entirely and just update the database. That's the problem.
And while yeah, the instances would block me, they probably wouldn't notice if I did it at a much smaller scale. In fact, there's no real easy way to check whether these upvotes from an instance are actually real.