It's no secret that the entire crypto space is largely dependent on centralized infrastructure (centralized exchanges, centralized wallet services, etc).
this is not true. the fact that people trade on exchanges and some newcomers use centralized custodial wallets doesn't mean bitcoin relies on centralized infrastructure!
and thins like centralized exchanges are popular and used because they are most convenient right now compared to the alternative and since there is no problem in using them, people don't bother working on any alternatives.
People will not want to use something that's considered "illegal" by worldwide governments.
last time i checked there was no such thing as "worldwide government"!
not many people will support it (only libertarians, geeks, anarchists, etc.).
this would have been true if such theoretical ban came back in 2008 to 2009 not in 2020-2030+ that a very large number of people have already adopted bitcoin and a million dollar industry has been built because of bitcoin.
at this point it is like talking about government banning usage of the internet!