At this point does it matter? Theaters are on the way out. Who wants to go to some dirty crowded room with a bunch of strangers when you'll be able to just stream it in your home? If you have to go to the bathroom in the theater it's not like you can just pause the film until you get back.
With all that said: I wouldn't mind a commercial or two airing before the movie. Trailers themselves are commercials for films.
Also it is because theaters are on their way out that these places need to scrape together any cash they can..hence them showing commercials that aren't trailers for other films.