The popularity of superhero movies overall is a benefit to both studios so competitors doing well is ultimately a positive for all involved.
The same goes for Marvel Studios.
It’s so much nicer when we can all just be supportive of each other rather than have to pick sides.
At the end of the day, Warner Bros. doesn’t care of its film makes more money than whatever Marvel is doing, WB just wants movies to make as much profit for the company as possible.