Happened to us, we built a bot[1] to buy and sell bitcoins privately on Telegram. Someone messaged me saying that they would get a 'SCAM' label on our bot if we didn't pay them the ransom. We didn't comply and within a few days we got the label(guess they managed to get a lot of accounts on our bot to report scam). Their support team was unresponsive and it took around 3 weeks to get it resolved.
Needless to say, our users lost trust and we couldn't risk this happening again.
We still run the service(from request of a few existing users) but not actively promoting it.