Why are so many dental flossers discarded on the street and in parks?

In case you are not familiar with them, these are Dental Flossers
I see them on the ground in almost every parking lot. Why? Do they have some other nefarious use? Do they have an application in drug use, or car theft?
I figure anyone who is conscientious enough to floss their teeth while away from home, would be courteous enough to put the thing in the trash after use – or save it for reuse later.

Why are they discarded in public spaces?