Why upwork client send invitation more than 100 people ?

[shyam524]

I am seeing some client invitating more than 100 of freelancers . They do not even hire. Why they want to waste freelancer and their own time ?? 

[mwiggenhorn]

In my opinion, these are often scammers.  I always stay away from those job posts.

[msublette]

I usually won't even bid on a job that has more than 5 invitations.