Wait, so using the same private keys on multiple accounts on separate instance can work? When you post a comment from all those accounts with the same private keys at the same time, the servers will accept only one of them? How does replies work? Will replies to your comment get sent to just one instance or all your user accounts in other instances as well. Is this only works on lemmy or is it a hack that's not always supported by all ActivityPub implementations?

Sorry for the barrage of questions. I knew that accounts already have private keys associated with them, but I didn't know it's possible to use them at the same times across multiple instances without any negative impact.