I do think it would be nice if there was a way for community mods to choose to combine two communities across instances,

If they are willing to cooperate that far, they could as well merge the communities

I don’t want Harry Potter fans coming here, good god. I’d rather sound with a habanero-infused DS stylus than hang out with Harry Potter fans.

Hey, I’m a fan of the universe, I hope I’m still welcome here

Well, you said it yourself, you’re able to comment using your Db0 account on Lemmy.world.

Which websites can you post to using your Reddit account besides Reddit?

Nice explanations and schemas, such as this one

I personally don’t really know of any content posted by a bot that I want to see).

Some communities use bots to schedule recurrent posts. Those can be useful, and mostly provide a feature we’ll hopefully see built-in the platform in the future

Good point