I think it’s a huge shame this scheme has been abused by so many - as obviously there are folk who do have hidden disabilities, which these are valuable for.
That said - there are very few conditions that would mean you couldn’t medically wear a mask (uncomfortable yes..).
The number of folk I’ve seen who are frankly just incredibly unhealthy (putting it politely..) who have no issue in showing these lanyards off whilst also lighting up another cigarette to aid their respiratory system is beyond me..