I'm a master's engineering student. I wrote my thesis in Overleaf and it was fine until I wanted git sync, which sits behind the paywall. I didn't want to pay a subscription for something that should just work, so in my free time I built the editor I wanted: open a tab, write LaTeX, get a PDF, ...
Source: [Hacker News](https://github.com/swimmingbrain/texbrain)