If everyone has and knows how to use Bitcoin then they can transfer as much as they like for <$1 ATM, and it'd be a much easier process.

Sorry, but no that's an extraordinarily privileged take. $10 is a lot of money for just transmitting some USD. And it goes a long way in El Salvador. I highly doubt the average remitter is sending more than $500/month, so it represents a 2% tax. I only consider $10 an acceptable fee if I'm sending tens of thousands of dollars.

There isn't any currency conversion because El Salvador's official currency is USD. Assuming it's WU on both ends there's no settlement risk. It sounds like pure greed.