Meditation does not work for everyone. Some people may find they they relieve stress and anxiety from other forms of relaxation like exercising, reading, or watching a movie. Others may find meditation an unpleasant experience altogether. 
There are other ways in which people can stay mentally fit during quarantine, even if meditation does not work for them.
Starting new routines during a pandemic may cause more stress and anxiety for someone already overwhelmed by the changes that have happened since the pandemic. People that are used to sticking to a routine may find it difficult to integrate new habits into their daily lives. Therefore, trying to find time to meditate could cause a person to stress out more.