And really, once you start using a lot of resources at a cloud company they start asking about you and your workloads because they want to up sell you more services. I'm sure they're also thinking about what kind of credit risk you might be since the industry generally operates on a post-payment basis. They will also require further information if you're doing things that have potential to harm their services such as email sending.

There is no good reason to demand the identity of people spending 1000 bucks a month on virtual machines that nobody is complaining about, it's outright totalitarian.