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The shady world of Brave selling copyrighted data for AI training
(stackdiary.com)
This is a most excellent place for technology news and articles.
For me it's because Firefox is (or at least was) noticeably slower. Didn't support all the extensions I use. And didn't allow YouTube playback with audio beyond 4x play speed.
All of those items led to me to choose brave over Firefox since I encountered every one of them on a daily basis.
Also I hated the default font (or perhaps it was some other quiirk of the layout) of Firefox. I couldn't figure out how to fix it.