There's only enough BAT for every internet user to have 0.33 BAT each

It would be great if Brave achieved that level of adoption, but even if only 1/10 internet users use Brave, that's 3.3 BAT each. At current usage levels, if all BAT was distributed equally amongst Brave users, there'd be enough for 41.4 each. For context, BAT atm is $0.65. I've earned ~ 45 BAT in the past year.

If Brave Browser sees continued growth, you really don't need much BAT to be a significant holder in the future.

(4.5bn internet users, 1.5bn total BAT, 36.2m monthly users)

This is not even taking into account other ongoing Brave projects, like the Brave DEX, which will provide cashback on fees in BAT, Brave Talk (which doesn't accept BAT as payment, but they've said that's in the pipeline), or self-serve ads.

P.S you can use youtube on Brave to listen to youtube without getting ads or having to keep your phone screen on.