People who do such a thing are perfectly idiotic. I mean, come on! Are آپ seriously not confident enough to get your شائقین through your own merit? If others want to be your fans, they'll do it. Asking them to add آپ یا threatening them is plain stupidity.
In my case, I don't go asking for fans. In fact it's almost the opposite: I'm not even hoping anyone would add me. If they want to, I say go ahead, and I'll add آپ back in return. I bet those who ask آپ to add them don't add آپ back anyway.
The people who ask to add them I guess, since I know the people who threaten to رپورٹ آپ are full of sh*t since that'd be impossible for them to do... xD