Actually I think the whole crypto market should adopt those Islamic finance rules because there is too damn much manipulation and wash trading going on.
Don't compromise your free for false security. It will evolve, crypto foundation was to move away from regulation and rules. Why you want to go back
Centralized off-chain transactions are simply not part of crypto, but a remnant of the traditional, corrupt way of banking.
There are rules in the traditional, corrupt banking world because that is the only way to stop it from devolving into a completely dysfunctional mess - now it is just a partially dysfunctional mess.
The way to go forward is to have just a few essential rules, such as all transactions should be on-chain and transparent. Not rules that only apply to commoners, designed to be circumvented by the financial elite.