Coinbase NOT for gambling, will got banned. i got banned once.
but if u buy bitcoin from them only then is ok.
Bitstamp i havent use it.
use currency exchange better, and use local exchange for u to buy bitcoin more convenient.
Banned for what ? How can you gwmbke there ? Even if you could why would you be banned ? The only bans I know on an exchange is chat ban. I have never ever heard of account banning. Why don't you expand and tell us what you did and how it happened ? If what you say is true I think it would benefit others to share this info.