Are you seriously complaining about having to pay for using their resources? I understand that you're surprised some things aren't covered in the free trial or free credit or whatever, but getting $300 free already sounded a little too good to be true (I heard about it from a friend and was dubious; at least in Europe, consumers are told not to enter deals that are too good to be true), you could at least have checked what you're actually getting.

I think it's weird to say you get credit in dollars and then not be able to spend it on everything. That's not how money works. But that's the way hosting providers work and afaik it's quite well known. Especially with a large sum of "free money", even if it's not well known, it was on you to check any small print.