Here is a post explaining it: sh.itjust.works/post/63897215

It just happened. Tesserect is a front end to Lemmy (like old.red-dit) that was actually nicely built, but apparently taken over because it was abandoned. Since you’re new, being on different instances is a little opaque to me as a non-techy, but here’s my experiences

• I think the largest instance is doing the same thing.
• Your instance is known to be full of aggressive trolls and are the lead developers of Lemmy. Most of us take user by user, so you don’t have to change instance. But if you get a lot of people hating on you for seemingly no reason, that’s probably why (or they’re trolls, we have them here). Lemmy was developed by the admins of your instance
• I’ve only heard good things about piefed, but haven’t made the switch myself to try it, since I’m a mod on lemmy. It would be a pain to switch back and forth.