Scam is wrong word to describe ptc investigation and was used just because ptc investigation often abuse this term to get more traffic and misslead people.
This is what this post is really about; 37bux claims to be blackmailed by ptc investigations (the blog that claims to investigate ptc sites and got many followers). The blog is also known for a lot of false information spreading about many ptc sites and their owners as well as having a lot of banners on their blog. They had so many links and banners promoting affiliate links that the blog barely loaded. Google marked them as a bannerfarm site and suspended their blogspot account.
I won't take sides and will only provide the links to the information I have seen so that you can decide for yourselves. But remember to always use different sources of information before you decide to belive in something.
Here is the link to earnmoneyspace forum thread.
I hope PTC Investigation will stop fooling around and act professional.