While not a cloud platform, I had an experience along the same vein with Stripe. We're a health-care startup, and this past Saturday I got an email saying that

While not a cloud platform, I had an experience along the same vein with Stripe. We're a health-care startup, and this past Saturday I got an email saying that due to the nature of our business, we were prohibited from using their payment platform (Credit Card companies have different risk profiles and charge accordingly--see Patereon v Adult Content Creators). Rather than pull the plug immediately, they offered us a 5-day wind down period, and provided information on a competitor that takes on high-risk services. Fortunately, the classification of our business was incorrect (we do not offer treatment nor perscription/pharma services), and after contacting their support via Email & Twitter, we resolved the issue in less than 24-hours. So major kudos to Stripe for protecting their platform, WHILE also trying to do the right thing for the customers who run astray from the service agreement.