1) Either the decentralized software system can't easily be updated without true consensus - which will make it slow and cumbersome (like bitcoin) or there will be a central authority that can just change the rules at any point - which will make it centralized (like Ethereum Classic vs Ethereum fork). Every web 3.0 related tech that I've peeked at looks to be like the latter - it claims to be decentralized, but is actually controlled by some central authority that is authoring the whole thing.
2) Governments aren't going to stop enforcing laws just because the activity moves onto a blockchain. Governments will most likely be slow to react, sure - but ultimately all these decentralized encrypted bits flow through a cable that the government can just cut. Wireless signals aren't an answer either, because the signal can be located and the antenna owner introduced to a wrench. A lot of web 3.0 promises that I've seen seem to either implicitly or even explicitly promise freedom from government policy, which I think is naive at best.