I really doubt Brave will be able to support manifest v2 for long after chromium deletes that part of the codebase. Brave does not have the resources to maintain a fork in perpetuity. They are really just a reskin with a marketing team (privacy conscious individuals being the mark).
This same conversation is being held about Vivaldi as well, as they are subject to the same thing. Unless and until people move en masse to Firefox or other, the monoculture invites abuse by those who control it. This is the new milieu of control.
