I don't think the problem is with the message, the problem is with the way it is worded as a personal email from A to B when they probably thought they were getting a generic 'A has invited you to join FounderDating!'.
You also have an incredibly bad attitude, and have a difficult time taking constructive criticism. Your default wording is ridiculous. A user wasn't able to understand the consequences of your UX. That's a failing on YOUR part. Grow up.
Woh... Grow up? All they posted was that they DID have an edit/see message button... how is that failing to take criticism?
I am not saying I disagree that this practice is shady, but I am not sure where the bad attitude and grow up part is coming from. There is a lot in between "your practices might be misleading and slightly shady" to "grow up you have an incredibly bad attitude"
See her other replies. The only correct response to this type of situation is a professionally worded apology and some soul searching to determine where the zeal for viral distribution outpaced commonly understood limits of ethical marketing.
A user was asked to endorse people, but that action ended up endorsing a product; that is the very definition of deceptive viral marketing.
Someone who is too eager to attract users and too confident to politely respond to even the most scathing criticism is clearly struggling with a lack of maturity. If this was an overly zealous employee, that would be one thing, but the founder/CEO? Giant red flag.