From my personal experience, here as in most of life, what you see depends on what you are looking for and where you choose to focus. I personally find italki an amazing learning tool for which I am grateful. I have found teachers and community tutors, language exchange partners for real-time talks, and others with whom I have had enjoyable text conversations. 

The world is full of random noise. Learning requires filtering that out. It can be tricky. One of the things I am practicing -- on italki, as everywhere on the net --  is to ignore those who happen onto a free site and just use it to randomly kill time. Because I am a native English speaker it might be easier for me to read nuance into the English messages and know which to ignore. Maybe it's also  easier because I am older than most everyone, so I don't get hit on as much as young women do. It still surprises me, though, how indiscriminating the time-killers can be. 

I was more frivolous when I was young, so I try not to judge harshly.  Given my age, I'm motivated to look the other way, where there is depth. Hopefully everyone who's killing time now will live long enough to move beyond that as a way of life.