I'm not sure whether paying 250 per post is actually different from ideological censorship.

Maybe the difference is whether your organization portrays itself as a public utility or a topic specific social club. Perhaps if the tos specifies the limits to speech (which the Donald does) that is sufficient... So if twitter can explain their policy they can keep 230 protections but they would be held to it. I like the ability to pay to dispute, but there should be a penalty for being found in violation, at a minimum you get your fee refunded.