They have started doing just that with "LaCros" [0].
[0] https://chromium.googlesource.com/chromium/src/+/main/docs/l...
[0] https://chromium.googlesource.com/chromium/src/+/main/docs/l...
[0] https://blog.crosexperts.com/google-is-taking-chrome-out-of-...
The comment I submitted only went so far as to say they started doing "that", referring to the parent's post about decoupling and providing separate updates.
I guess alternatively, one could run Chromium under their Linux instances on a lot of them.