Giving things for free often leads to making enemies.

This sounds harsh, but it's the truth.
There is a trash picker auntie on the first floor of the community.
She has asked the residents upstairs several times: "Are you throwing away this cardboard?"
The residents always say they are keeping it to sell for money.
The auntie's face immediately darkened, and the resident pretended not to see and turned to leave.
It's just a few pieces of cardboard, after all.
The resident isn't stingy; they've just been taught a lesson.