That's the thing, you can't stay anonymous on the internet forever when you are using the internet infrastructure and domains which are controlled by the gov.
"Forever" is a very long time. You can stay anonymous for a reasonable time. Fire up Tails OS and use Monero as p2p e-cash. Pretty good anonymity. Just don't mess it up by linking your real world identity.
“Staying anonymous for a reasonable time” isn’t going to be enough if your are working on a project that can possibly disrupt the world.
What is reasonable? 3 months? 1 year? 10 years? How long will it take for the government to come up with a hint? Do you think we can delay the inevitable, say, for 5 years? Then what? Do jail time?
Forever anonymous is definitely what you want if you are working on a decentralized project which the government won’t like.