Because there has to be political incentive too. It's kind of hard to explain, but i'll explain it in a way without legal speech (im a tax lawyer by trade). Most lawyers and accountants for the DOJ and IRS pursue things for political and monetary goals. you're right money is an incentive, but you have to imagine how backlogged the government is. I interned with the SEC (a whole other government agency but still got a good idea of government work when it comes to financial crimes/fraud) and there was a 800 page excel sheet of people/orgs they have to go after. The IRS has yet to go after most PPP Loan Scams from years ago. The government has to pursue much higher level objectives (for examples, misappropriating government money and tracking the derivative market) because those costs the government so much more money. Also with derivative markets being so closely alligned with how rich people make/made money and where campaign finances came from (i.e. FTX and SBF), you have to realize poker vloggers are peanuts. Yes they will go after it so the government can get their peanuts/stop unregulated gambling where no fed government/state agency gets a kickback, but it will take a longggggg time.

I work in accounting, you would be surprised how much creators can get away with. look up eric tway trykarat interviews. there are ways they can gain the system, but it does involve a lot of guessing on the creators' part.