Because it's Brave and people like to jump on bandwagons. This is like the 6th time I've seen this article posted in lemmybin also.
And since we have the reddit-minded folk here, no, I do not support Brave and never will and I would much rather they disappear from the internet, but using ragebait to complain about the browser installing the necessary files to have one of their advertised services working, like pretty much every other software does, is not the way to move forward.