This scam is actually pretty old, this is the most recent post, but if you search "Escort" in that subreddit there's dozens of posts.
My guess of how this works is if you contact a scam ad, and they can't get you for the deposit for "the girl" (who doesn't exist), then they come back later and try to get you with the blackmail angle.
I actually got one of these texts a while back when I cussed out a sugar daddy scammer trying to run the fake cheque scam lol.
TLDR ignore it...actually extra pro-tip, block the # too. If the loser doing it is desperate they'll send gory pics to try to freak you out, shit you really dont want to see, again speaking from experience 😕