Well firstly those strange coins are pretty much money at this point. They might not be as universal as fiat, but you can 100% live a comfortable life using only crypto, albeit it might be a bit more work. Secondly I think clicking "yes" to a message saying "you want to support the developer when your computer isn't doing work for you?" Is easier than sending fiat in most cases. I do concede though that it only really makes sense if you live somewhere with cheap eletricity.