Since it is advocating that the plastic straws in the milk tea shop be replaced with paper straws, why not also change the plastic cups in the milk tea shop to paper cups at the same time?
It is understood that some businesses have recently replaced straws with paper, but still use plastic cups.

No best answer

Because plastic straws are very difficult to recycle, the paper straws are introduced to limit plastics, and the essence of plastic limiting is to protect the environment and save the earth which is constantly being plasticized.