Why is he pardoning a drug trafficker?
Let's be honest anyways, the cryptocurrency "industry" as we know it is less than 4 years old, and in 4 years it may be gone. Exchanges like coinbase and so-called defi innovators like A16Z need this legally-dubious signalling or they'll risk never having another leader corrupt enough to sanction their behavior.
I thought the "legal tender" argument only worked in regards to debts to the government, though IANAL.