Sounds like a bit of fear-mongering to me. I've done my share of internet friendships and internet dating, and I've certainly met people like that - but I've also met such people in real life. Really, I do think that part of the problem is that people let their guard down online, in part due to anonymity, and in part perhaps because it's NOT the real world, and then they get overly attached to someone they've never met and get hurt when the person they built up in their heads doesn't meet their expectations. This happens in real life too, perhaps less frequently, but it happens.
Also, I don't think the use of the word "rape" is appropriate. It's an emotionally charged word, and the use of it in this context, imo, both riles up the bystanders to crusade against the perceived threat, real or not, and diminishes the experiences of people who really had been raped.
ETA because I missed a word.