This is pretty accurate. tl;dr: What I did wasn't great but it could have been a lot worse (see all the things I made it a point of not doing), and that gives you something to think about when it comes to data and privacy.
To make it clear: You advertised an anonymous service to a community you're a direct member of and didn't disclose your involvement in it. You not only willingly broke a moral code that you knew about, but you actually misrepresented the service in your advertisement and broke any trust you had with everyone who participated. That's a pretty serious wrong doing that warrants a little more self reflection and much more empathy towards the people you screwed over.