Kind of, yeah. The DOJ IMO is pretty ignorant.

That being said, I also don't think the browser "duopoly" is as entrenched as market share suggests. As Chromium is open source, the cost to the consumer of switching browsers is minimal; Chrome, Edge, Brave, Vivaldi, Opera and un-googled Chromium all offer very similar browsing experiences and the main difference is small UI things. If Google does something anti-consumer, people can jump ship very easily. Other corporations can also fork Chromium very easily (as some have already done).

Are any of the Chromium-based browsers going to retain manifest v2, or are they all stuck with neutered extensions? A quick search says even Vivaldi is going to lose v2 support later this year. Brave and Edge are non-starters.

Honestly don't know. I've never cared much about extensions. Most people seem to care about ad blockers, which Vivaldi has built in. I don't see many ads because the sites I frequent most often, I pay to see.