As you listed the scheme, I think it's better that the solution to valid it should also be added.
1. Recovery Scams: After someone loses huge amount of money to a fake casino, another scammer claims they can recover the funds for a fee. They simply take more money and disappear.
How to avoid it: Just avoid any solution from a random posts from unknown users. This is not in only gambling, but virtually everything involving money scam online. They would claim they were scammed and so & so website or attorney helped them to successfully recovered the money. My brother, flee!!!
2. Clone Casino Websites: some casino websites you see around are clone casino websites and they are done by scammers just to scam gamblers, this scammers copy the design of well-known casinos to steal deposits and personal information.
How to avoid it: Know the website you are opening, and double-check the security, the exact domain and the domain extension (.org, .net, .com, etc).