Beehaw is another Lemmy instance. Kbin in a different piece of software but it uses the ActivityPub protocol so it can interact with Lemmy.

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RedReader will continue to be free, it was granted free access to the API as it is considered an accessibility oriented app.

It is but Oracle can take it back without justification.

You’re in for a good time. I found some boss fights to be quite difficult but I loved it.

I can attest sibling comments are meant to be federated (example thread from another instance: https://lemmy.world/comment/97687), but I was here at the very start of this instance and there were federation issues. Posts not showing, comments not showing on other instances. It’s all very new so there may be technical issues.