That it is ABSOLUTELY NOT how it works.
Just to be clear.
Whether it's a hit or flop isn't a matter of our opinion, it's a matter of the studio's opinion, and no Hollywood studio, not even one, thinks "made a profit" is enough to not be a flop.
Why? Because of opportunity cost - all the time and money you spent making a movie that barely made a profit could have been spent making a movie that made a large profit (and a high proportion of movies do make a sizeable profit).
If the D&D movie isn't looking at least $300-400m worldwide, in a few months, it'll be a flop. Even $300m might be a bit low.