Show HN: Proxy Orbit – Rotating Web Proxy API for Pentesting

And potentially dangerous, right?. What's stopping me from creating a bunch of MITM proxy servers and just waiting until someone using this service rotates to mine?

From the website:

> Using advanced proxy checking algorithms, we constantly monitor the quality of our proxies removing those that are no longer working.

What are these "advanced proxy checking algorithms" and how do they verify the security or authenticity of an open proxy on the net? They seem to mention the availability of their service, "Our checking algorithm is aggressive to ensure the highest likelihood of the proxy working when it gets to you." But mention nothing about the security implications of the potential breach of confidentiality if a malicious actor were to set up an open server.