this post was submitted on 04 Jul 2023
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If that is a solution you'd need to change the ActivityPub specification. You are more than welcome to submit your idea.
I'd first have to create 2000 users, then I'd have to send 2000 upvotes. And then I'd get blocked by all instances.
This is also not compatible with the ActivityPub spec but even if it were you'd win nothing because as soon as you fetch the post it is still on the server.
Hey, just curious: how would all the instances discover this type of fraud?
They'd have to check the upvotes, notice most of them came from one instance, look at the instance, check multiple users, and if they realize that these users were just created to get upvotes then they can defederate. However, it's too big of an assumption that moderators will go through that kind of effort to validate all the upvotes.
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.