The etiquette for this sort of thing is that the founder, assuming they're on the ball, asks "Can we quote your involvement publicly?" very soon after receiving

The etiquette for this sort of thing is that the founder, assuming they're on the ball, asks "Can we quote your involvement publicly?" very soon after receiving agreement in principle that you're in. I think both times I was asked that question it was literally within 90 seconds of the words "agree on a handshake." You're right that people treat this with a lot of sensitivity, but you're overestimating how much effort it requires to have a column in a spreadsheet. This is one of the many "quirky rituals around fundraising" which AngelList is busy automating. I am of the impression that "AngelList official" is now understandable with regards to an investment like "FaceBook official" is understandable with regards to an engagement.