I've got friends who work for another cloud provider and they had major fraud problems until they instituted rules like these. Since cloud providers bill for usage at the end of the month, you can run up quite a bit of charges before the provider realizes that there isn't any money on the prepaid card and you might not be who you say you are.
Say I need an AD with two users, just to play with some stuff I can build for customers with "real" AD implementations? No can do, I'm supposed to pay full whack for AD like I actually needed it to manage a domain. Screw that. I should get a free tier with, say, up to five users or objects (just enough to get an object or two for each common type) or some call limit. As it is, I just let my trial expire and now I won't even think about building anything around AD unless absolutely forced.
https://azure.microsoft.com/en-us/pricing/details/active-dir...
You get
Prepaid cards can be purchased anonymously. If you were running a cloud provider, would you rent a server to somebody who was essentially untraceable?