You'd have a more successful time arguing they were propping up Ethereum. Even then, what about the dozens if not hundreds of other places to trade for BTC...?

You'd have a more successful time arguing they were propping up Ethereum. Even then, what about the dozens if not hundreds of other places to trade for BTC...? And, to save you and others telling you, some time: exchanges are not the only markets. DEX is a huge factor.