Besides M3GAN, are there any other movies that begin with a fake commercial?

The only other one I can think of is Robocop 2

Child's Play maybe?

UHF maybe?

Raising Arizona maybe?

too lazy to check

Starship Troopers does

Robocop(original) had so many can't recall if there were some at the beginning.

Chopping Mall opens with a promo video for the killer robots.

Scrooged

I don't know if it would count, but David Cronenberg's Shivers (a.k.a. They Came from Within) starts with a narrated slide-based sales presentation for Starliner Towers, the setting of the film.

Blakkklansman opens with the Alec Baldwin commercial/PSA

Are your ducts old and tired?

Grindhouse had a fake trailer before the first feature, and three more between the two films.

Thought Sorry to Bother you might but that’s the start of the second scene.

Agency, a movie about an advertising agency.