Not a bad writeup, but really think you need to work on the TAM (total addressable market). Going from $50 billion to trillions is quite a jump, and $100 billion bet annually would also be a rather lofty goal unless things REALLY progress.

In other words, might want to do a little more research on some EXAMPLES of how big the PPY gambling sites can actually get.

We'd start here:
https://www.irishtimes.com/business/retail-and-services/paddy-power-betfair-to-launch-in-us-with-betting-exchange-1.2564517

Betfair made about $50mm in profits, so spread between 10mm shares of PPY, one could hope for maybe $5 per annum after MANY years of growth. With PPY between $15 and $20, that'd be about 25-30% return-- IN THE FUTURE. Not bad. But a lot of things can happen between then and now.