A very unpleasant situation, which is another reminder that you should always read the user agreement before using any gambling site.
In my opinion, the gambling site should have programmatically made it impossible to bet from the bonus account on the listed games and introduced the necessary limits. Otherwise it all looks very much like a not entirely honest business, with its creators covering their actions with a user agreement.
We should also understand that these gambling platforms are out for profits and nothing will give out profit "if" there are no traps set for those who can't read platforms TOS. Something like this happened to me some years back with some online courier company, after placing my orders with the best deal, i forget to read about their agreement and when the time of delivering came they sent me some messages that my country wasn't among the country for such deals, then, return my funds and my account was suspended till-date.
Not actually a trap because it had been said or mentioned in the TOS in the very beginning. Its just people who are neglecting on reading it up until they havent notice
that they had already violated the terms and expecting that they can really pull off those wins in the site until the management or admin will really make out some
hold of funds due to violation of terms and then suddenly they whine and telling the site is a scam or being shady but actually the main fault was actually
on you.So we should really be aware.