There are few online options, also you could just sync it to a common folder so it could work that way… But rarely thesis are drafted concurrently -
The main advantage of LaTeX is the easy type setting for journal articles/thesis etc and ease of changing the style.
Lol, what makes you think it’s dying? The MAU numbers are similar to mastodon, and a lot of the science community has shifted there (for ease of use compared to masto).