It looks alright to me, but I'm not sure there's demand for such things nowadays. There are already enough sportsbooks and casinos around, and most just die out even though they're not that bad. Especially with the economic crisis we're entering, starting a business now is a very risky decision.
And you're saying that you're using lightning fast technologies, but I assume it has nothing to do with the Lightning Network?
Moreover, do you actually take no money for this stuff and only plan to take 7-9% share from GGR?
They're a B2B solution, so technically they don't need new businesses to pop up for them to gain clients. If their software is attractive enough and/or efficient enough, established sportsbooks could have reason to switch their engine provider as well.
7% of revenue is actually a lot if you think about it. If they secure a sportsbook of a decent size, that could be in the 6 figures daily.
In fact, I would say that is actually quite high - even though there may be no costs upfront. The ongoing commitment will definitely drive some big corporations away who would rather pay a fixed fee upfront for a lower revenue share.