Because like every single other token being created recently, its actual use is almost zero and it's just a means of generating shitloads of money for the creators.
I use the Brave browser, and even I can see that it's trash.
I did not knew that they have already released the browser,is it the mobile version you are talking about.The problem with BAT is that people jumped into the coin when it hit the market as no one got the opportunity to purchase during the ICO period and then people started dumping it ,as simple as that,we could see any movement if the business model clicks.