Only "ask me again later" is the one that prompts you again. That's why I do mind that one, and appreciate the other ones.
And it doesn’t really help the user. If I click “Not now” and later decide that I do want the feature, how do I find it? If you want to reassure the user, just say that:
Enable cool new feature X?
(You can always change this in System Settings → Y.)
[ Sure ] [ No, thanks ]But we're comparing to the case where it just says "No", in which case "Not now" at least tells me I can look up how to change it later now - or more importantly, that I don't need to give this further thought now.
Yes, PMs (or anyone) making software doing dumb shit is dumb anyway, but that also holds true if it were labelled "No".
I was agreeing with you that indeed, I don't want software to bother me again with the question unprompted. Additionally, I appreciate the reassurance that the dialog isn't my last opportunity to set the setting (because sometimes that is the case).
So tl;dr: label the button "Not now", and don't prompt me again.