Yes, you are probably right. I prefer not to trust the Internet at all and only communicate with people I see and know. Nevertheless, the story of the privnote.com fake site, although old, is not safe from its repetition. A similarly named phishing site that masqueraded as an anonymous note service was stealing bitcoins.
Phishing sites appear constantly and for different services. I'm not sure if this can be used as an additional argument against using real services. It's like stopping trusting you because someone created your fake to deceive people.