It's good to take accountability in times like this because it is indeed really your fault for not reading their TOS. Reading it will provide you more knowledge about the casino's nature and rules. You will know the do's and don'ts of the casino which will give you more insights and more things to ponder in order not to do something that could put your account into a 50/50 situation such as suspension or banning of account.
Just think of this as a lesson learned to not make the same mistake again in the future. It is really the players responsibility to read everything and to know every details as much as possible to avoid encountering preventable problems.
The reason why players do not read entirely the ToS is that most of it are just the same as the others and only rare gambling sites have a rules like this. Usually what the players are looking for the KYC, Jurisdiction and I think that's it some of them are just the same or the standard and usually they depend it on the gambling license of the gambling site.