Well, government, Hollywood, Big music, Facebook, (arguably) Google, Craigslist, and any other enterprise which is large and makes a bunch of money, are clear and present dangers to the mostly free internet we have today. Which, considering my job, and considering the average startup, is the biggest threat to their existence.
Since it doesn't allow other websites to wholesale copy it's listings and data for their own use (and monetization) it is a danger to the free(loading) internet apparently.
Considering you now have to give up your copyright to them if you post anything there, I'd have to say yes. Abusing our broken system of laws makes you a danger.
If this bothers you, good. It should.