Counterpoint: they saturate the market with so many MCU, Star Wars and other high-profile (Avatar!) content that it is all but impossible for anyone else to get enough people into cinemas or onto streaming.
Like, people only have so much money and time to set aside for entertainment, cinema is one hell of an expense as it is [1] and now, when alone the MCU pumps out four movies a year, there is no budget left for anyone but them. Streaming? The same. There's an insane amount of high quality content on Disney+, and they got all the "cool and popular" stuff.
On top of that, Disney's treatment of, say, VFX studios is fucking up the market there as well: the more market share Disney has on the client side, the less choice studios and other suppliers have. Either they accept the sometimes disgusting behavior from Disney (especially ridiculous deadlines) or they don't have other clients and shut down.
Between the Mouse just gobbling up everything they can, Netflix pushing for a washed-down uniform standard [2] and small cinemas closing down left and right, entertainment is in for dark, dark times. Disney needs to be broken up and since the movie industry didn't get the hint from the music industry that rightsholders should take care of offering access to multiple streaming services, government has to mandate that as well. The lack of competition hurts everyone.
[1] a typical MCU movie for two people will be anything from 50-100$, including tickets, 3D surcharge, long-duration surcharge, popcorn, soda, parking/public transport
[2] https://www.vice.com/de/article/ake3j5/warum-sieht-beim-netf...
