Long story short to those not in the know:
Tate originally got rich from a webcam business that he and his brother started after he retired from professional kickboxing. Tate has bragged on podcasts about how he and the girls would scam lonely guys with deep pockets by getting them to fall in love with the girls, telling the guys that they were going to fly out of their countries to meet them, lying to the men about different emergencies and convincing the men to send them thousands of dollars regularly.
A video by YouTuber PatrickCC explains the casino part. He did research and learned that Tate owns around 13 casinos in Romania that he acquired shortly before covid hit.
Tate himself has spoken about being tied to "Mafia-types", so he no doubt got those casinos by being in debt to some shady people, be it the Romanian mob or who else.
By possibly being in debt to the mob, it makes sense that he's suddenly found a new lane in being an internet celebrity to cover the hit that his casinos took in the midst of covid.
He definitely has money, connections, and power, but I have no doubt that he associates with people that he has to answer to in return.