Both of them simply patch support back in, but they will not be able to do that once the code is actually removed from chromium upstream on later versions. They are not going to maintain it. Helium will take Brave route and integrate the Adblock (probably brave one that is open source). But this is irrelevant, at the end of the day the main topic is the fact that google decided v2 had to go, and other derivatives browser had to comply as they have not enough resources to maintain a full fork of chromium.