What can you infer from the fact that although cfc's have been banned, refrigerators and aerosol cans are still being sold?

Researcher must have found environmentally safer replacements for CFCs. That might be the reason aerosol cans and the refrigerators are still being sold. In aerosol cans liquefied petroleum gas is being popularly used in place of dangerous CFCs. Same is being done in refrigerators and other devices. The aerosol cans no longer hurt the ozone layer. Infact they have reduced the waste as they can be recycled now and has long life.

it takes about 30 days for it to break down

because if the tool that you are using is not balanced it there would be false mass.