Here's how I understand it. According to R' Shia Hecht, COTS is a cult according to his definition of a cult, namely an organization that uses mind control techniques to achieve its goals. That isn't necessarily a bad thing, it depends what the goals of said organization are and for certain people the techniques of COTS may be just what they need to get over their issues.
As for me, if i plan on willingly handing control over my mind to someone it better be someone I trust 1000%, I don't know about others but my mind is a pretty important asset of mine.