In what ways do you think publishers are regulated and how would those hypothetical regulations apply to Twitter?

Remember that Sec. 230 is about liability not about responsibility. That is to say it’s about monetary damages and not regulatory compliance obligations.

No. If I start a message board and you break the rules, I should be able to delete your posts and ban you without legal consequence. It’s my platform. Twitter has the freedom to determine what content they allow and don’t allow on their platform. I don’t see why this is so hard for people to understand.

I've seen versions of this take over the last few days and I'm curious what the actual stance is.

Is the belief that Twitter shouldn't have any rules against violence speech, or that those rules shouldn't apply to the president? Or is the belief that the president hasn't violated those rules, but if he did the rules should still apply to him?

Publishers are not strictly regulated.