But the military helping fund movies and providing both access, people, and equipment in return for positive portrayals has been part of Hollywood for literally decades? They're also involved in tv shows.

Captain Marvel being sponsored is not a new trend that only Disney has been open to. It's not even like the first MCU movie that had military involvement.

(Wings, released back in 1927 and backed by the Pentagon is considered one of the earliest big project.)

https://www.thoughtco.com/pentagon-support-for-war-films-3438458

This has been an issue that has rightfully been discussed over the decades.