The big difference with physical goods is that it’s much harder to steal a McDonald’s burger that it is to crack a single player, offline game. Furthermore, once you ate your burger, if you want more, you have to buy another because it’s a consumables.
On the other hand games are prone to piracy, expecially on pc, you pay once but can play anytime while patched and updates require prolonged work after you purchase.
It isn’t strange that developers look at dlc, microtransanction or game as a service with subscription, because they allow a stable flow of income that can support development, and it’s harder to avoid paying when the game is always online and stuff like that.