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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.
To be clear, that means Brave is ① invading their users' privacy, and ② stealing money from web publishers.
The point of referral codes is to reward web publishers for referring users to a product; leading to the user buying a product that they otherwise wouldn't.
Your browser isn't introducing you to a product. For it to insert referral codes for the browser vendor's benefit is stealing money.