So, did they give you any reason as to why you got banned? I guess it should be expected sooner or later but maybe something change. Who knows, maybe you're not the reason they decide to ban multiple accounts but some bot owners make them lose their money with this 'exploit'. At the end of the day, any abuse is likely going to get you banned. Hopefully, you'll find other works that pay you well without having you resort to abuse or cheating.