In the career path he chose which is reflection of being a hardworking, smart kid that as you mentioned likely did take some risk.
I do think the level of his success had some good fortune to it and that good fortune now separates him (billionaire) from the hundreds of his similar hardworking successful classmates (millionaires).
But I would venture to say without that specific good fortune in qualtrics he would likely still be a mid 40s multi-millionaire like his old buddies mostly are. I highly doubt he would have had another pathway to billionaire status if qualtrics never existed or failed.