With all due respect, I believe that you fundamentally misunderstand how the internet actually works. You're focusing on ISP's and changing ISP's if you're not happy, but it's truly not that simple. The issue isn't at the ISP level, but rather at a higher level with Tier-1 networks.
Tier-1 networks are the backbone of the internet through which ISP's make use of their infrastructure. Underwater cables connecting the world. ISP's contract through Tier-1 networks and utilize that infrastructure.
ISP's are able to make decisions on their own traffic, yes. However, they themselves are the one beholden to any decisions made by Tier-1 networks that they're contracted to.
An ISP is powerless if a Tier-1 network that they're with decides to censor or blackhole a website, and most likely aren't even aware of it. Changing ISP's does nothing if they're also contracted to the same Tier-1 network.
As consumers, we're customers (us) of customers (our ISP's) of a Tier-1 Network. We have no direct business relationship with the Tier-1 Network, yet due to Net Neutrality no longer being on the books, they are free to make arbitrary censorship decisions. If Net Neutrality were still around, the Tier-1 Networks would be legally required to not censor arbitrarily as they're currently doing. We, then, are reliant on our ISP's to either complain to the Tier-1 on our behalf, as the customers themselves, or actually follow through on switching their Tier-1 Network contract, which is no small undertaking and might not even be possible depending on circumstances. The former isn't guaranteed to happen, let alone to work, and the latter is a ridiculous ask that may as well be written off it's so improbable.
Your argument might apply if the issue were at the ISP level, but it's not. It's at a level above them. It's not as though Cox or Comcast is the one we're having the issue with. In addition to that, many areas in the US (and probably worldwide) are subject to strict locational restrictions in terms of internet service providers. If you live in a Comcast-serviced area, you better believe that you're going to be stuck with a Comcast internet provider, with very few alternatives. It's not as simple as "switching" when you're geographically bound to them and literally have no other options.