Could this be tied to Google's push to force everyone to use Manifest 3, and nerf Add Blockers?
Additionally, if you are concerned about MF3, your best bet isn't some outdated Chromium fork – it's Firefox.
I kind of assumed as much, but unfortunately that also most likely means that it'll lose Manifest V2 support at some point (not that upstream Chrome will keep it).
That seems to be the concern of some people commenting here, and I wanted to highlight that the two are largely orthogonal as far as I can tell.
And doesn't Google have leverage over Mozilla by way of their funding?