I pay for premium, you get what you pay for, don't want to pay, then watch adds, it's the rules of the internet. Plenty of sites refuse to show content with add blockers enabled, can you blame them? Unfortunately people seem to assume the right to have things at other peoples expense, the world does not actually function like that.
Brave is all about privacy bla bla, if brave users want ultimate privacy then they are withholding the usual internet currency and must PAY with another currency like USD, GBP or whatever you use when you PAY people for services.
It's not that expensive, and yes you can say that uh curiosity stream is cheaper, but it's also shit. You get what you pay for.