Apple’s 30% tax on IAPs is ultimately a convenience fee on impulse buys. Whereas inherent in the process of sneaking Apple-taxable-purchasable under their nose necessarily requires a very inconvenient process: buying crypto from a retail exchange, then moving it off-exchange to a tumbler, then back again to to buy something from the same (or another) retail exchange is far from convenient - and definitely not instant - so it is not in any appreciable way to circumvent Apple’s IAP tax, because it simply comes down to the fact you can’t make impulse-buys through that system - never mind the txn/gas fees in cryptocurrencies make it very wasteful for microtransactions, or really any transaction below tens-of-dollars.

I’d agree with you provided Bitcoin’s Lightning network worked the way we hoped it would back in the early-2010s, but it doesn’t. Otherwise, your argument reads like is saying Apple should tax every PayPal transaction made through PayPal’s iOS app.