Will Brave, which is based in Chromium, still block ads? Since they are changing Chromium, I don't think so.
Pretty sure Brave shields isn't based on an extension API so it shouldn't be affected.
Have people actually noticed worse performance from uBlock Origin lite?
This article isn't nuanced enough. Ad blockers will continue to work.
The ones Brave choose to block, sure. You're going to end up with the same problem eventually.
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I mentioned this above, but Brave both includes its own ad blocking engine and has also added support for the MV2 version of UBo to the core engine.
https://brave.com/blog/brave-shields-manifest-v3/