Every time I see a post about a note-taking app, Obsidian is mentioned in the comments. I don't know if the app is really good, or if those are just paid comments. At this point I'm not even surprised anymore, especially when conversations always end with a mention of Obsidian Sync.
It's the biggest & most popular app in the note-taking space. It's closed-source, which I don't love, and I've tried to look for alternatives, but there just isn't anything else that's as good as Obsidian. In a situation like that, you don't need to pay people to talk about your product. People will evangelize it on their own.
It's because there are two ways to sync content across devices, paid sync through Obsidian vs. git. Given sync is a p0 feature, it seems logical that both get mentioned when the question arises.
Also, the app's really good, and I pay for Sync -- git works well, but it's a bit clumsier on iOS. Never posted a paid comment in my life.