The amount of hype surrounding this movie is a red flag. Studios will often over promote big budget films that are not good enough to recoup the big budgets poured into them. Since I have been hearing and seeing Captain Marvel everywhere for at least the last month, I am guessing that the studio knows they have a flop on their hands. This is especially bad since this movie is supposed to have a major impact on the big Avengers movie coming out in the summer.
I think that Disney and Marvel are trying to mitigate their losses. They must realize that they have a flop when they need a blockbuster to lead in to Endgame. Their only hope now is to have a big enough opening weekend to offset the losses when bad reviews plus word of mouth tell people to stay away.
Seems like they forgot the first rule of escapism. People want to imagine themselves as the hero, and if your hero is the antithesis of your audience, you must tread very carefully to get your audience to care about your "hero."