Companies used to do this, but stopped when every game reviewer called them out on it. It was always in kinda shitty games too. You can rest assured that EA is fully capable of making shitty games with ads in them.
GTA is filled with parody ads, which are actually fun content and not intended to make you buy something. The second they become real ads, you'll have brands complaining about being displayed next to gun violence or prostitutes, and all the fun goes away.
There's a reason there's no real car brands in GTA, because none of them want to be associated with running down pedestrian and drive-bys