Entrusting our speech to multiple different corporate actors is always risky. Yet given how most of the internet is currently structured, our online expression largely depends on a set of private companies ranging from our direct Internet service providers and platforms, to upstream ISPs (sometimes....
If you ask me (and nobody ever does for good reason), one of the only times an ISP should be pulling the plug on online speech is when you start linking actual malicious links that have a good chance of your grandma losing her retirement funds or your tech illiterate uncle getting a crypto miner installed on his laptop or something equally destructive.
Your ISP should have no insight in to your traffic at all. Therefore unable to make any judgement on what traffic to block and what not to block. With the exception of volume of traffic and to where it is going.
I remember getting a warning years ago from an ISP I don't use anymore that my service would be cut off if I downloaded a pirate torrent again. Why the fuck were they paying attention to what I was doing? Even if it was piracy, it was none of their fucking business and they wouldn't be implicated. I've used a VPN ever since.
Although I do agree they should have no insight, I'd rather the insight they currently have be used to actually block sites from bad actors than just spying on you to most likely sell your data.