In the future, it will be for advertisers who want to advertise their products in the brave platform. Right now, I think it will mainly be for traders or late investors. Traders who want to earn about the hype about the BAT and investors who want to earn for the long term.
It's something big. It was lead by the creator of Javascript so it's really big. It'll probably be one of the good things to exist in the future so if you want to invest for long term profit, you can invest now. It could be subject to pump s and dumps soon though cause that's kind of how it works. But then again, I'm just speculating. So I'm probably wrong. But I'm confident about BAT.