Ok, why Brave though? There's Safari, Chromium, LibreWolf, Ladybird, and plenty of others.

1. Because it's most popular. Guaranteed support and "monkey see monkey do".

2. The adblocking is preconfigured, and non technical users trying to find the right extensions has a very bad history of unintentional malware. Ad block? Adblock plus? Ublock? Ublock origin? This is a great example of what floors a lot of technical folk who would be "why not just install ublock origin" and fail to understand the "why should I when I can just get Brave one and it works"

3. Most people don't use macs

Librewolf meets 2 and 3 (it comes with ublock origin preinstalled), but admittedly fails 1 quite badly.

Not everyone is on Mac. In fact, most people use Windows. So Safari and Ladybird are out of the question, that's two gone.

They mentioned the built-in adblock

Brave is has pre-configured as block that works on everything, also a polished sync experience.

Vivaldi's sync experience is nice as well. Top notch customization too.

Vivaldi is often behind on chromium security patch. In fact they are right now.

I started with Vivaldi. Was unstable in my experience. Constant crashes.