That doesn't make it any more legal or responsible for harassment.
The issue isn't the way the site is worded. The issue is, people are submitting numbers, PB is POSTING them, and even if they weren't encouraging people to bomb, they sure aren't condemning it or pulling numbers that are being harassed, which means that (in some states) they are in fact encouraging harrassment by letting it go on.
You can say something is for "educational purposes" or say "people MAY bomb this number, but we don't condone it" and it doesn't mean shit depending on how it's carried out.
Also, if you would have saw the forums, it contradicted the site with all that "don't call this number, for educational...." shit strongly enough that it alone could have gotten the site shut down.
I think you had a good idea, Phone Bomb, but I think you may have let it go too far.