Probably too many old fart executives that "know better", plus directors or writers with a pet project that have to drop it and work on a "stupid game movie"
Not sure if this is a rhetorical questions, but I assume a statement like that comes from examples like the "Borderlands" movie. I'm not a gamer, but I remember seeing a lot of talk around the casting not being true to the game.
You have a movie ticket and a deluxe movie ticket with special in movie content that only you can see with special AR glasses and instead of ads at the beginning of the movie. We shows ads all the time and they change based on what data we have collected from you.
Hollywood five years from now when they've milked this to death and have to try come up with original and creative ideas again: "Please save us! We're in ruins!" And just like with the MCU, all of the people that were happy to cash out when these video game movies were at peak popularity will be blaming video game movies for being the death of cinema and art the moment one movie performs poorly.
You say that, but the first Angry Birds was actually pretty good as kids movies go. It probably helped that there was an incredibly simple premise, and they got a not terrible writer to put something pretty good around it.