I didn't want to link that site because it's....fairly political and negative.Oh... my... https://boundingintocomics.com/2019/06/12/alleged-set-photo-from-dc-universes-stargirl-heavily-implies-series-set-in-same-universe-as-titans-and-doom-patrol/
Next thing you know, it goes from a fun show to...
I was just Googling "Stargirl set photos" today and stumbled across that.
But yeah, I guess that puts Stargirl in the "Titansverse" with (possibly) Doom Patrol. Swamp Thing is the only one that stands out, but I don't see any reason to remove it yet.