It seems to not be related to the coupon codes. I'm thinking they can't truly handle the computing power they sell at that price, and of course practice overselling (which isn't a bad thing, normally!). However, I wish they had a way to pay a bit more and get DEDICATED resources, so maybe for $2.38 an hour or something you could get a full 24 cores dedicated to you (which is probably a full node for them). However, unless they go down this route, I think mining accounts will keep getting banned. It's unfortunate. They asked me for details about myself. I gave websites, names, facebook, location, public twitter handle, and public business handles on an account I made with a different payment system, which according to my understanding of the ToS is perfectly acceptable. They locked this account as suspicious.
I think I'm done with digital ocean.
Did you make all of the accounts from the same ip? That might be the problem. My account is fine for now.
Nope, have switched IPs 4 times.