Yes, if you allow the adverts you get a small pop-up box once or twice a day which you can choose to close by clicking the X or open it. If you open it, a new page opens and you can read it or close it.I'm just looking at this now and am a bit puzzled. It says:-
3 ways to fill your wallet:
• You can add funds.
• You can earn tokens from viewing ads.
• Occasionally, you'll be offered free token grants from Brave. Be sure to keep an eye out for the alert!
It doesn't say anything about collecting tokens purely from browsing? I am presuming that you have to click on the adverts (which are hidden by default) to get tokens?
The alerts are the same as the notices you get if you allow sites such as City's official club website to give you news. You can switch them off and on as you like.
I haven't found more than a couple of sites that can be contributed to, and BM is a recent addition.