A lot of illegals also sell fruit cups as you mention. You see them a lot in Battery Park, the Financial District, the Seaport, and to a lesser extent Bryant Park. They are unlicensed of course and nobody bothers them. But other vendors need to be licensed, store their carts in City approved storage facilities etc. Haven’t seen the bagels for sale, but churros are also big. It’s all a scam. They are not being industrious per se. They are being funded and provided with the inventory, most probably by churches, relief organizations and maybe even the City itself.
And theft.