7. social engineering (Soft begging)
I have seen a lot of times people in the casinos chat telling some really sad stories with the intention of touching other users' hearts and that way receiving some coins. We can call it the shame speech.
Who would believe a sad story that is being told by a random person in an online chat nowadays? I thought that the "Nigerian prince" email scam would never survive in the long run. Maybe I was wrong.
Anyway, OP has mentioned all the ways the gamblers are trying to scam the casinos. We should make a list about all the methods the online casinos are using in order to scam their customers.
I think that the credit card fraud shouldn't be mentioned here, because:
1.This is a crypto gambling forum and most crypto casinos don't accept credit/debit cards.
2.Most online casinos(both fiat and online) are trying to stay away from credit/debit card payments, because they might get accused into supporting money laundering/CC fraud, so their business might be facing big trouble.