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Pretty sure Opera, Vivaldi and Brave does not sync to google servers. The syncing to their servers will still work fine AFAIU.

Can't speak for the others, but Brave uses it's own sync system and is not affected by this.

Yeah as far as I know every major Chromium browser has their own system. Why would they want to use Google's system?

Chromium would have to safely store and manage user data on their servers, which is an additional cost.