I use Google tasks for my todo list. This GNOME extension is nice and minimal and just what I’m looking for, and it uses todo.txt. Is there an easy way to sync my changes with Google, similar to how the GNOME calendar app does?
EDIT: Endeavor (GNOME “To do”) seamlessly integrates with Google Tasks and ostensibly todo.txt but I can’t get it to recognize the todo.txt (I’m not sure it would sync todo.txt > Endeavor > Tasks even if it was working, however).
I prefer not to sync my information with Google or other entities either, but do not think that using Linux precludes using whatever tools they like. I don’t think this is a question about ideals, but about tools and compatibility.
I personally also doubt that Google Tasks supports that capability, unfortunately. I personally use Thuderbird for email on Linux, and it supports tasks too (I use Nextcloud for my tasks but I bet it supports Google as well). Not the same as your gnome extension, but an option.
Good luck!