They get defederated wherever they get consistently banned...and then they can federate with their friends and make their community of shit and yell at each other or something.
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Can it be practical if several instances get created programmatically?
I believe there is a whitelist mode, that isn't currently enabled but in that mode new instances are defederated by default. That would be a pain to administer for all the small instances joining, so they may set some size or reputation rules to apply for federation (??). I imagine this is inevitable if automated instance spamming becomes a problem, unless some type of RBL comes in vogue for managing federation first. It may become impossible to manage manually.
E: oh the whitelist thing may only be relevant to kbin federation, as that was the topic I saw it in. Sometimes I forget where I am :-/
You federate with that instance
I don't usually make a habit of being an ass, but I am extra careful about what I say because I choose to self host. Since any instance admin that decides not to take a liking to me could take one look at my instance and defederate me without a second thought. If anything, self-hosting makes you more vulnerable than just normally ban evading on an open instance.
I agree with Jamie. While it is certainly possible for a bad actor to spin up burner instances for the purposes of evading defederation, that's a disproportionate amount of effort compared to just creating a new account somewhere that already exists.
Will we see it happen? Probably. But it honestly seems easier to deal with than if those bad actors were to hide themselves in established instances.
I could see that happening, exploitation by self-hosted bad guys. Is there any type of moderation within the federation framework to avoid that kind of thing?
Right now I think the federation is small and new enough to avoid that kind of exposure, but I'd be surprised it did not become a threat as the federation network becomes larger and more well known.
Instance admins can blacklist & whitelist other instances from federating with theirs. If you have a lot of bot spam originating from a particular server, you can just add them to the blacklist to prevent them from interacting with yours.