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Why you shouldn't use Brave Browser
(www.spacebar.news)
This is a most excellent place for technology news and articles.
In a just world, the fact of changing the user agent fixing the issues would make for a slam-dunk anti-trust case.
It really should, no doubt, but this is not a perfect world
If you confront Microsoft with this, then they will say they don't have enough resources to test "thousands" of browsers which is why they have restricted their efforts to Chromium only, while making billions of dollars in profits each year.