For the record, "opt in" has a specific meaning. For your spamming to be considered "opt in", a user would have to actively take an action that indicates that they want you to spam their friends. What you have described appears to be an "opt out" scenario.
> FounderDating asked me to identify ten that I would vouch for. I didn’t have to do it but I thought oh well, I guess I’ll do it and see what happens. So all I did was click their photos. Nothing more.
Can't speak to the rest of the flow but clicking photos indeed sounds like opting in.
I can see how it'd be easy to miss the fact that this will send an email, although it's stated unambiguously, at the top of the page, and underlined. And it's definitely opt-in. I have to select folks.
Thank you for posting the screenshot but I don't think this is the one I saw. It was a different flow. I was not applying and asking people to vouch for me. I believe I was asked who I would vouch for.