Are there any open source TV firmware projects? In theory, I don't mind smart TV features, I just don't trust most companies with my data, and getting the interface right is hard.
but AFAIK due to their complexity and the continuous changes/updates/releases by the TV manufacturers they tend to be outdated or however compatible only with relatively old models.
This is interesting. Honestly if all it did was provide a simple OSD display for input selection or basic settings like color/contrast I'd flash my TV just to get rid of all the bloatware on it.
Vizio TVs run Linux, systemd etc. If Software Freedom Conservancy win their lawsuit against Vizio for GPL violations in their TVs, you will probably be able to install open source Linux distros with Kodi on any Vizio TV and soon afterwards lots of other smart TV vendors will be similar. Maybe there will also be an equivalent of OpenWRT for TVs, a distro focused on improving open source TV support.