Marshall has copyright on his lyrics, you just said yourself patents and copyright are different things.
Sufficiently different rip-offs that don’t confuse consumers as being the original should be legal. They already are as far as copyright is concerned.
Many design patents should never have been registered, and should lose when defended in court. Design trademarks are a third similar issue.
I’m aware not all coins are proof-of-work mined using coal generators. Proof of stake isn’t punk either.
In all honesty there’s nothing to make better, I believe the central issue with crypto is that it doesn’t solve any real problem.