Personally I don't believe that is the case only because I do think Captain Marvel made a billion, not because people liked that movie, but between 2013-2019, every superhero movie made bank regardless of quality, and Captain Marvel was the movie before Endgame so people were watching it to see how it ties into Endgame. That's also part of why the sequel bombed because it didn't have that hook for people to watch it.
As for Disney fucking over Sonic 3 to benefit Mufasa, if Disney had that power, many of their movies wouldn't have bombed last year and even this year they had bombs. Mufasa just has an advantage over Sonic 3 since it had a worldwide premiere while Sonic 3 was released gradually worldwide since some countries aren't showing it till this month. I can believe this is not Disney sabotage only because Paramount is also run by idiots, second most idiotic studio with only Sony beating them.