Well, I choosed italki because I read some article about this site. I found it good since it easy to look for a teacher, book a lesson and pay through PayPal. I also like to correct some notebook entries and write my own notebook entries. During one year, I took 165 lessons.
I used to enjoy a lot the discussion section. I changed my mind since during this month of April some 15 persons got banned definitely or suspended temporarily (including myself) for no reason at all. We were accused of not having respected italki guidelines. So I hesitate to write again any post because I am afraid that some vicious troll will flag me once more. All the pleasure is gone. Once I will finish the lessons for which I already paid I will look for another similar website. There are many!
I've been asking myself the same question a lot recently