alt Hacker NewsForks are giving up on mv2 because it's not as important as the people online say it is. If mv2 was what would cause a browser to gain market share they would keep maintaining it, but if the market is not rewarding browsers with mv2 then it does not make sense to maintain.
Seriously. The average person in real life has no idea what MV2 or MV3 is. And despite what people here would have you believe uBlock Origin Lite works nearly as good as uBO and is generally indistinguishable from its MV2 counterpart. A casual user wold not be able to tell the difference, nor do they care.