Brave has plenty of problems and chromium base is only one of them, here’s some easy examples from recent history:

https://www.androidpolice.com/2020/06/07/brave-browser-caught-adding-its-own-referral-codes-to-some-cryptcurrency-trading-sites/

The issue came to widespread attention yesterday, when Twitter user @Cryptonator1337 pointed out that Brave Browser auto-filled a referral code to the end of the web address when "binance.us" is typed into the address bar. Binance is a cryptocurrency trading website, and with that referral code, Brave Software could earn 20% from trading fees for every account created using the link.

https://cryptobriefing.com/basic-attention-token-rebounds-despite-brave-autofill-controversy/

• Brave browser reportedly redirected its users to the company's own referral links when navigating to different platforms such as Binance, Coinbase, and others.
• Following the incident, the price of Basic Attention Token plummeted over 6%. 
• But over the last few hours, the bulls appear to have stepped in, signaling that BAT is poised for further gains.

Best case scenario Brave is difficult to fully trust, why go out of your way to use a browser that tries to monetize your usage?

While we’re at it fuck every chromium-based browser. Why help google conquer the internet that much faster? Because that’s how they attack unlock origin and such, that’s how they introduce lag and pauses for people visiting YouTube on non chromium browsers, etc.

Brave is malware that should never be used. If you need a Chromium based browser, Vivaldi is a good choice. Otherwise Firefox.