It is just not feasible for me to pay for every single plugin that changes something on my site... I am not rich.... its fine if it would be one plugin but if you have 30 installed and most of them require you to pay 50 or more, it isn't doable... for me. So far I have not been burned so I am...
100% safe is hard to say as the site is, as far as I know, not curating the content. But it is one the best communities I have seen around with people genuinely trying to help each other.
Have been using this site for a few months now and so far so good. I bought plenty of premium plugins before but just cannot justify every single purchase, especially if I only use it for a very short time.