Years ago, I played with AWS then contacted their support to make sure any AWS billing to my account was disabled.
I thought I'd try it again recently, and couldn't log in.
I still don't think I'm missing anything.

I'd rather have VPS or server providers where I know exactly what I'm getting per month no matter what, tho I've ran near data transfer surcharges.

First thing I learned in a video course was setting a spending budget for your account. I set a $10/month limit and never broke it in 6 years.