Another user shared their folder with me to allow me to upload some work product I had done for them. I only have the basic free dropbox they have 3TB and they are no where near full. I can't upload any of the work product becuase dropbox says I am full. I have nothing in my drop box (ZERO!) but all of the other users work product counts against my quota. This seems like a heavy handed way to force people to pay for a subscription they don't use.
Other clients Onedrive & Google Drive share options work without this arm twisting to forcing me to buy a subscription to contribute to their shared folders (folders that don't even belong to me).