And they make money by you having to buy BAT to give it. Either with the information gathered from which ads you view or by having to buy it to begin in the first place.
Actually, they don't make money on sales of BAT. Like most cryptocurrencies, its price is determined by supply and demand.
Sure, they’ll benefit if BAT goes to the moon because part of the team’s compensation is in BAT, but that’s no different than a startup and their stock.
