@Dashtop afaik, yeah. They even refused my pull request to add FastMail to account setup in Geary and that’s when I stopped trying to contribute there. No time to waste with surveillance capitalism bootlickers and apologists.
Though it strikes me that GTK headerbars should be more open towards window managers which want serverside decorations... Doing so shouldn't be hard, that codepath adding the window controls is already conditional!
And I'll agree of top-of-thread: Yuck!
For people who care about, support, or build Free, Libre, and Open Source Software (FLOSS).