Earlier quoted context omitted.
Those sites hosting degoogled Roms might be blocked themselves by the ISP. In addition, certain countries may require you to run approved Roms, and if you don't you can face prosecution. This has been done in action in India with ISPs like Jio to block TPB for example. Remember - any traffic over the internet can be logged by your service provider (eg. ISP, VPN, etc)
Sure, and when they release the mind reading necromancers we'll all be totally screwed, too.
Mass File Sharing Blacklisting has been enforced by Indian ISPs since 2019
VPN+ISP traffic log sharing has been enforced in Kazakhstan (along with SSL stripping)
Blocking Tor downloads has been implemented already (with varying levels of success) plus attacks to deanonomize Tor have started occurring since 2021.
Turkïye has implemented ISP Whitelisting ostensibly for Children but the same core technology can be extended to everything - https://internet.btk.gov.tr/guvenli-internet-hizmeti
App Store restrictions and region locks have existed in Mainland China since the early 2010s.
It's very easy to tamp down and censor internet based communications. Individual corporations have the capabilities to apply such censorship if they wanted to, let alone ISPs.