I would say, if it looks like a duck and quacks like a duck, it's probably a duck. This is gambling, in my opinion. I think the TAM you cite would indicate that money you win from the free "starter" package of tokens is not gambling, but if you are buying more tokens with after-tax money, and you are awarded cash for playing with those tokens, it sounds like gambling.
More importantly, for $90,000 deduction, you need a CPA who will take a position and back you up if you are audited. If CPA #1 doesn't want to take a position, you may need to go to #2 or #3. If no CPA will back you up that this is gambling, then either it isn't, and you don't deduct the cost of the tokens, or you stick to the position that it is gambling, and represent yourself if you are audited.
