If your message doesn't show up on one webpage, you can always publish it on another, or on a webpage of your own. If your ISP decides what webpages you are allowed to visit, that's basically it. If they don't want to let you contact any competing domain registrars, you won't be able to.
I suppose technically that'll never happen; you could fall back to a dial-up ISP. After all, the phone company is not allowed to decide that you can't call their competitors. One tiny part of the Title 2 regulations that cover telecommunications forces them to allow all telephone subscribers to call all other telephone subscribers. It's telephone neutrality. Look up the whole MCI thing from a few decades ago.
I suppose technically that'll never happen; you could fall back to a dial-up ISP. After all, the phone company is not allowed to decide that you can't call their competitors. One tiny part of the Title 2 regulations that cover telecommunications forces them to allow all telephone subscribers to call all other telephone subscribers. It's telephone neutrality. Look up the whole MCI thing from a few decades ago.