Chrome and even Firefox have already begun political policing of their browsers (https://reclaimthenet.org/google-chrome-web-store-bans-disse...). The next step seems like it’ll be forced curation of the web or blocking of IP addresses, since they’re already knocking on that door.
They banned a sleazy-looking extension from their extension stores. That's a far cry from "forced curation of the web or blocking of IP addresses". And, if that happens? Someone will just fork the browser.