Yeah, but you can do similar thing with bitcoin. BAT/Brave is cool, but every app having their own currency isn't useful, expect for speculation purposes. It's like having to use different currencies for buying different products in a grocery store.
Bitcoin also has its own limitations compared to smart contract platforms. And not everyone is cool with buying the bags of Michael Saylor and Nayib Bukele.
We have multiple social media platforms and multiple search engines. We can have many cryptocurrencies.