I had a similar experience at LinkedIn in its early days. Back when we had maybe 500k members, we A/B tested the hell out of our invite messages. These messages were critical because no one had heard of LinkedIn at the time (~2004ish) and no one knew what social networking was or why they would want to sign up. And getting new users to accept invites was incredibly important to us. We A/B tested many invite email for…
So important that you resorted to every dark pattern in the book, it seems. I'm not exaggerating when I say that I don't know any of my tech friends who haven't had a bad experience with linkedin tricking them into spamming invites or similar.