"Just install LaTeX" is really not a valid response when the LaTeX toolchain is a genuine nightmare to work with. I could do it but still use Overleaf. Managing that locally is just not worth it.
Keep in mind this is the same project that removed all useful functionality from the included web UI in the community edition with the excuse that it was too much effort to maintain.
This is another case of VC-funded companies pulling up the ladder behind themselves.
Following that logic it would be literally impossible to trust any part of their infra. They had a bad build container, the rest of their stuff was solid.