Insight into the Dangers of Using Free Proxies

[Afasoas]

Using free proxy sites instead of VPN has been discussed here a few times. I've mooted that it's not a good idea. After all, not many things in life are truly "free".
Christian Haschek has analysed about 20,000 of them:

https://blog.haschek.at/post/f01d0

[mrcharly-YHT]

Nothing in there mentions proxy systems like Hola, where your machine can be used as a zombie to run code. So that report isn't even painting the most gloomy picture!