If they tried to put one out the same day the movie releases, it would be rushed shovelware. There's probably some terrible mobile games that are part of the marketing, but besides cost being too high to make terrible games purely for money, the market is also too competitive. There's wayyyyyyyyy more good games to choose from in this era than there was in the 80's, 90's and early 00's and consumers have so many resources available to them online to find out that a shovelware turd is actually awful, with reviewers actually willing to skewer a bad game (especially when it's an opportunity to talk about ruining ip or comparing Marvel to DC).
That and the Arkham games have basically made it so that Disney/Marvel has an insanely high bar to reach, can't allow the brands they own to be mismanaged and tarnished by awful multimedia products that make them seem inferior. Until they're capable of delivering (which Disney Infinity probably will lay the groundworks for their forays in the future), they will probably leave well enough alone, instead of their ips being known as "the bad ones" in the gaming industry with an unprofitable sector that loses money.