This is a little bit "late". Fastmail has supported Bitcoin payment for a very long time. In fact, I was surprised last year when I wanted to try proton mail and they didn't have Bitcoin payments.
So in a way, his test was completed (no I don’t want to use this service) before he was even able to test their product.
Just imagine you want to test the food of the newly opened restaurant downstairs. Before you actually get to test the meal, have been treated like shit. Sure, you could have stayed to try the food, but you have already decided that it is not worth it.