you are not being forced to use those browser but rewarding users with such tokens is one way of their marketing to possibly attract users  . You can't be rich by using this browser so you better think now if that's what's your plan  . This is a browser and browsers are useful for browsing the web  . Every browser have thoer own feature and so as this brave . They are private and crypto based or close to cryptos and block chain , I think they are first with that because I all other browsers I see are just normal .