If you want to promote free software, you promote it everywhere where you’re allowed to. I bet they posted it on Reddit too. It’s just how things work. No one will know what you’re doing unless you patiently and kindly explain it to them. Otherwise FOSS and federated software is just an exercise in onanysm. Like, there’s a reason all streaming services buy ads on cable. You got to promote your stuff. Plenty of open source projects die simply because they refuse to or don’t have the marketing skill to promote the project.