From that... barely $10-20 per month.
I simply don't believe that Brave users are actively topping up BAT so that it's distributed.
Instead I put a PayPal donate button on one of the websites - no target published, no progress, just a dumb button on the home page and to the side.
That single donate button gets ~$500 per month and is enough to cover most of the costs associated with running all of the websites.
I still think the best way to provide a good, ad-free, tracking-free service - is to ask your users to contribute what they feel the value is.
NB: This is not my job, I'm pretty sure I could make a lot more money if I cared to but this is a side project and done with no need for profit. Meeting costs is all I'm going for - BAT is not going to do that and my costs are low for what I serve.