Without commenting on the validity of their business or the amount of money allocated, your premise is badly flawed. There’s no reason to think one’s SWE ranking at Google would correlate with success as an entrepreneur. (There’s fairly obvious arguments one could make for why they might be inversely correlated.) Furthermore a median engineer at Google is presumably at least a top decile engineer worldwide. Ultimately, life isn’t a report card, there’s lots of different paths to success.