Because they have shitty mobile games that people pay microtransactions for regularly, which people wouldn't if they made real games.
I can only imagine what kind of money their mobile games pull, but if there were real videogames with not shit graphics see all console marvel games since this movie shit started then why would people sink so much money when they can play a better game for a fixed price on a bigger screen? Unless Marvels movie division tanks to the point that they need to make good games to give their characters exposure and all that you aren't getting shit and that goes for everyone.
If mobile games didn't exist there would be plenty of current marvel video games.
Also your thoughts/opinions/wants are bad and wrong and so are you. Feel bad. you may not enjoy current media no exception.