You really live up to your name. By purposefully making the site unusable for people that do not use Brave will not result in people installing Brave to use it, but instead it will cause for the majority of the userbase to fuck off. That's not how this works you dipshit.
But okay, let's say that Null is as retarded as you and makes the site unusable for anyone with a "Brave user agent".
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There seems to be no mention of "Brave in it. Okay, let's see what user agent Vivaldi has:
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Oddly enough it's almost identical to the user agent of Brave. Okay, let's see the user agent of Google Chrome:
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Huh, it seems to be identical to the user agents of both Brave and Vivaldi. Who would've guessed.
In short: user agents are not reliable because more and more browsers based on Chromium identify as Google Chrome because Google, Facebook and all those other big sites break small things for anyone who has an user agent different from Chrome. So your fantastic idea of forcing anyone who doesn't use Brave off the site with annoyances completely falls flat.
That's why Null is in charge of the site and not some random retard who doesn't even know what user agents browsers use.