Chromium browsers can't make that pledge and those that promised have red flags in my book.
1. These browsers can barely add their own functionality on top of upstream, and maintaining Manifest v2 compatibility may be expensive. Consider that the development of Chrome exceeds 1 billion per year.
2. They all use Chrome's Webstore as a distributing channel, except for Edge, but IMO, Microsoft has an even bigger interest in seeing uBO die.
Brave itself has ad-blocking built-in, which won't be affected, and it's fairly capable, but promising that they'll keep compatibility with uBO is a lie, if they ever made that promise.
