It's more than that, although I agree with you on the source of the money. It's the networking and connections that his family had that helped him to grow it. You can't discount the man, his tenacity and personality, though. History is littered with trust-fund kids that squander everything (my ex-brother-in-law is one). Growing your money is the exception to the rule.
Just watched Tilman Fertitta getting interviewed on CNBC. Some notes about his businesses : His restaurant/empire revenue has dropped around 10% per day thanks to coronavirus. Most of the losses are around urban area restaurants and major steakhouses thanks to things like meeting and convention cancellations, but restaurants in the suburbs seem to be doing ok. Even regional casinos are ok, but Vegas is starting to get hit. He's down $1,000,000 per day in revenue. Says things in terms of his business are bad in China -- he re-opened a restaurant in China and the revenue for the day was "zero". Says that's never happened to him before. Regarding coronavirus and attendance at games : We had a lower no-show last night vs. the Clippers than usual. The only no-show was us. Seemd to be saying people should go on living their lives and not be scared to death of coronavirus and stay at home... just use precautions as they're being told. @KingCheetah ...
Here's the video... https://www.cnbc.com/video/2020/03/06/tilman-fertitta-on-coronavirus-energy-and-the-nba.html