Specifically, while there is a strong social pressure involved when dealing with your children's tutors, there is almost none when dealing with complete anonymo

Specifically, while there is a strong social pressure involved when dealing with your children's tutors, there is almost none when dealing with complete anonymous people on the internet, many of which are likely to be criminals. I would like to see an attempt to quantify the two effects, but I would venture to say that switching from an altruistic motivation to a financial motivation will increase the bandwidth available by orders of magnitude. For example, compare private trackers with public trackers.