I think Kantuchdis was joking.
Once you pay, they will have proof of your payment via Paypal. In other words, it will be much harder to deny if they follow through the next time they threaten you. Once you pay, you are their annuity forever.
There's another scam where you get an email with a password associated with your email that's available on the dark web because of one of the various data breaches. They say that they have taken control of your computer camera and have video of you doing something raunchy. They also claim to have all the email addresses in your contact list and from your email, and threaten to release the video to everyone if you don't pay. It's unnerving, because it's probably a password that really connects to you, but the threat is total bs.