It's not, but on the other hand; not sure if Cardano fans are like eth/btc people; the 'non investor' fans of the latter that I know (some with millions $ in them, some with a more modest amounts) or read about online have no 'feeling' for the relation with the $. For them spending $100 in eth/btc is not the same as spending actual $100. I helped some friends add crypto payments for their services/products (because of covid) and they all say that crypto people/fans are far easier to deal with; they don't care about fees/rate, they round up and they don't ask for refunds under $100.

1 ADA is the lowest amount on the Cardano chain. I'd prefer it to be much lower for this game. I'm releasing an update soon where you'll be able to make multiple moves with one transaction (still 1 ADA), but that's the only way I've found to lower the cost of playing.