User blog comment:Dman6233/OT Live Action Teen Titans Series to air on DC Digital Service and be produced by Arrowverse writer, Greg Berlanti in 2018/@comment-4300738-20170427021457/@comment-4300738-20170427025606

I think the fact that Wayne Enterprises/Industries exists, and that Robin is presumably popularized enough to get a Halloween costume made after him, I think it's safe to assume Batman exists at this point on Earth-1. He just hasn't been mentioned or appeared.