I noted that posting links to RG is restricted by BF.
I understand that RG is a competitor to BF and I also recall that there was trouble with spammers advertising for RG after the great crash. However I also think that BF and RG target slightly different audiences as BF allows anonymity which in turn allows both venting and a discussion which is more at ease. Personally, I prefer BF very much - I wouldn't want your boss to be able to look up every single thing you ever asked or said, especially when you are a relative beginner.
Sometimes I try to link to a helpfull comment on RG, in which case I can't unless I deliberately write it wrong, which creates confusion as obviously link only work when written correct. As the main purpose of BF is surely providing a platform for helpful discussions and there are also many beginners out here, I'd find it more purposeful to lift the restriction (at least for links, it wouldn't hurt to leave it restricted in plain text). I can't imagine it would have a significant disadvantage for BF, as this is nonethless a very different place, like I said above.