Your first link is based on XUL, which was deprecated because it was wasting resources being unmaintainable and insecure.
Here’s a great article about that
Why? It depends on the business model, even RMS says it’s ok to make money with open source
Android doesn’t use glibc, but Bionic, a C standard library developed by Google. So I don’t think this vulnerability affects Android.
I’m not agreeing with “worse version of Obsidian”, but Obsidian with Syncthing works great for p2p synchronisation.
Shit meme