So, let’s try an AU where the bats are complete isolationists.
I mean, they’ve had contact with the world outside Gotham and villains outside Gotham, but they’ve completely and totally avoided other heroes.
So, There’s a Justice League, but no Watchtower.
There’s a Teen Titans, but without the Robins.
There’s a Red Hood, but no Outlaws.
Tim’s Young Justice never existed because they just joined the Titans.
No one is allowed in Gotham - meta or not. Gotham is theirs.
So, you have all the other heroes and then you have the Bats.
And, frankly, the other heroes are a little wary of the bats. They have no idea who they are or what they’re capable of?
They’re from Gotham - they live in Gotham and take care of Gotham and Gotham is one of the most dangerous cities in America, if not the world. Gotham’s villains are crazy.
And if the bats are taking care of that, then they have to be… well, pretty dangerous. No one wants to cross them. And even though they want to find out what their powers are, no one wants to risk going into Gotham after that time Superman tried it and came out 5 minute later with a sliver of kryptonite embedded in his arm (just because no one knows about the bats, doesn’t mean the bats don’t now about everybody.)
And then comes the moment when the bats have to break their isolation.