Sounds super annoying sorry it sucks but who exactly are they defrauding in your view? And what numbers are they gaming?
But I certainly feel ripped off applying for jobs they never intended on filling. If they put up a lot of hoops to jump through to apply (submit a portfolio, set up an account, write a cover letter specific to our company), times that by the 1000 people who have applied, and it's an exorbitant amount of human time getting wasted.
I know this analogy breaks down a little bit since this behavior does actually happen, sort of, in real life p2p markets but the point is, it sucks and if you've ever sold anything on fb marketplace you know how obnoxious it is dealing with people who demand a lot of you but do not intend to actually commit to buying what you're selling.