If people stop using cash, how can street performers, musicians, food carts etc. survive?

Of course, digital payments oppress those who use them, because they track everything. I don't use my credit card except with airline tickets and fees, and car rental. For the rest, it's cash or nothing, and if I business doesn't accept cash, I don't buy there.

You can help defend privacy every day simply by firmly telling businesses "cash or no sale, and no you may not have my name."