I agree with you but I think a far more effective way to "win" this for consumers, would be to press both Apple and Google to clarify disambiguate the 30% from the total cost to the consumer. i.e. just like on a grocery receipt where you clearly see the sales tax you pay as a separate item from the price charged by the vendor, this is what people should be fighting for - both in the app stores, and on the receipts that are emailed to people for their purchases.

It would (a) make the tariff visible to all consumers not just the techies, and subsequently (b) create significant customer-led pressure to lower the tarrif (I suspect something on the order of 10% would probably be acceptable to most customers as that aligns with typical sales taxes give or take).