It is an interesting idea to implemented bitcoin into paid browser, I do hope this project can continue and expand, the more bitcoin user the more stable price we got, hopefully it dont slowing the internet connection that we have and contents of the ads is informative
It's cool i give you that 
but i don't see more users than some geeks trying it out. people tend to be lazy and not care, so i don't see why they should bother.That's why they should implement those 15% payments to users as soon as possible. Earning BTC for browsing, even if it's only few satoshis per day etc., could be pretty strong incentive to switch to Brave. Currently only available option to enable users to pay for browsing is not appealing at all to average user.
@xuan87 - the general idea is to improve page loading time, so it won't slow down internet connection.