The use of chlorofluorocarbons (cfcs) have been banned by many countries because cfcs

increase electricity bills
reduce the lifespan of refrigerators
are ozone-depleting substances (ods)
have an odor

The use of chlorofluorocarbons (CFCs) have been banned by many countries because CFCs  are ozone-depleting substances (ODS) .

Explanation:

The chlorofluorocarbons (CFC) are derived from the saturated hydrocarbons obtained by the substitution of hydrogen atoms by fluorine and / or chlorine atoms mainly.

It is now known that the appearance of the ozone hole over southeast Antarctica, at the beginning of the austral spring, is related to the photochemistry of CFCs present in various commercial products (freon, aerosols, paints, among others). In fact, the prohibition of the manufacture and distribution of this type of gases has allowed the ozone layer to show the first signs of recovery.