His dad wasn't on the board of IBM. His mom was in the board of a charity where she had met the chair of IBM. Even so, IBM wanted CP/M but Gary Kildall blew up the deal, only then did IBM approached Bill Gates and asked him if he could provide an OS for the new IBM PC.
Sure, the connection did help, but it wasn't pivotal to the deal. They were already in talks with Microsoft to buy Microsoft Basic which was the standard back then, shipped with all personal computers from all makers. They offered Microsoft the MSDOS contract before the chairman realized he knew the mom of the kid in charge of the company.
Using personal connections to get business is standard practice, any business owner will tell youu about business they got because of some personal reference. You still need to have the record to back up the personal connection. Just because I know the owners of Google does not mean I am about to get the contract for Chrome OS.
So let's recap: Bill Gates had already founded a company that was shipping the most popular basic interpreter at the time and had already been offered the OS contract for the IBM PC before someone high up at IBM realized that he was "Mary Gates' kid". Out of this he made a 90 billion dollar fortune.
Cheeto Jesus on the other hand got a million dollar from his dad, before he had succeeded at anything and parlayed it into four bankruptcies and a heavily leveraged "fortune" that is so huuuge he's not willing to show his tax returns.