I think it could slow adoption, but I've been primarily buying offline. Soon I'll have a lightning node too--improving my BTC privacy.
Defi exchanges are the next major advancement to government resistance as well. This space would rapidly mature under government regulating away self custody.
> rich private currency economy will grow unmolested by tax collectors
Honestly I wouldn't mind that either. Governments in general are absurdly corrupt and taxes finance that corruption the same way drug users finance cartels.