What is the best steelman'ed argument you have against "bitcoin is a scam"? I literally seize up at how staggeringly dense this statement is and how confidently it is declared.
Discussion
any scammy behaviors related to Bitcoin are a Layer 2, and function only because the collaborative effort maintaining the network makes Bitcoin valuable.
is USD a scam? or is it scam enabling because it functions to transfer value?
There is no way to respond to this really. If they are open to learning then the right things to say are obvious. But if the statement itself is really spoken? Very little chance of breaking through.