Yeah, I love Doom Patrol more than any of the DC films but it's not gonna have the same audience draw for the cool kids first half. It also got its advertisement push in that it was part of HBO Max's launch.
Titans is absolutely filler but will be advertised as new HBO Max content to draw in new viewers.
So Flash and the CW shows are the big push for the shows it seems. Anything that came from the random DC app is basically a new show to 99% of people.