Previously tech companies got the benefit of the doubt when they said "we don't have control over the content our users post. We only host them"

That's not how it works. Saying this as someone who spent a year fighting a lawsuit over section 230. In order for sites to claim protection they must show they've made a reasonable effort to police their users. A platform owner can't throw their hands up in the air and plead ignorance. "I didn't know my users were threatening to kill someone in my forums!" My company won the lawsuit precisely because we proved we made such a reasonable effort.

Twitter is doing exactly what is required of a platform to stay on the right side of the law.