Emphasize the cost of support plan during 12 months trial
When you go to upgrade your subscription page (after 1 month with 200$ credit), you have to select a support plan. And on the side it says that you won't pay for free services or services that are paid during 12 months of trial. But you do have to pay for support plan. I think you should add a noticable warning there. I'm not sure if there was a no support plan option there, but it should be.
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Oleg K commented
Also, after creating my VM i saw that cost started to grow. Maybe i won't be charged for that, but it still looks weird after MS advertising 12 free months. AWS is more clear on that and there are no hidden costs and if you use free tier your bill shows zero.