I don't know anyone who works at either company so maybe one of them is full of nasty people who hate their customers and one is full of lovely people who don't

I don't know anyone who works at either company so maybe one of them is full of nasty people who hate their customers and one is full of lovely people who don't care about making profit - but that's very unlikely. Much more likely is that they both want to maximise their profits, they both understand that offering a good service to their customers is the way to do this, and both approach this in different ways. And frankly the fact that a Stripe employee said a nice thing about them as opposed to "fuck them use Stripe" doesn't give any clue on the subject, it just says this person is a.) polite and b.) not an idiot.