Haha I didn’t know that restaurant take out was an American topic. Some people…
Anyways, I 100% agree with you. These containers cost pennies, not dollars. From a business standpoint having take out containers is part of overhead i.e what you absolutely need to be in a functional business. Some restaurants are trying to flex their overhead and turn it into a profit maker.

“You know what, those containers that we’ve been providing for free since forever ago, let’s start charging a 150% markup on the container and start making money on them!”