Now? I think you've missed that by a bit which is understated in the same manner your "now" is.
In contrast, in Craigslist-land I'm interacting with just a phone number or an email.
I did this a few years ago to sell a PS5 in the outskirts of Metro Detroit.
We were in communication with the possible buyers and saw them turn into the lot. As soon as we asked them to meet us inside they got cagey, hung up, and just left.
In my experience, in a FB marketplace transaction where the buyer picks up the item, the buyer only pays after personally inspecting the item and (often) haggling a bit.
Prepaying using Zelle for an unseen item is very weird.
I'm not sure there's a particular reason to think it's a bot or AI is there? It could just be a script and a call-centre type operation.
Anyways, I sold a ton of stuff on FB marketplace before we moved out of our old place, only allowed cash / venmo payments and they had to come pick it up
For example, my partner posted an item for sale in FB marketplace.
The buyer said she couldnt pick up item, but her brother would. She could pay via Zelle, all she needed was an email & phone # . None of that seemed weird, so my partner agreed.
The buyer then said she sent a Zelle payment. My partner got an email from "Zelle Pay" saying money was pending due to my partners account not being a business account.
Luckily, we know zelle and didnt fall for it. The sender was a Gmail account.
My partner must have been talking with a bot.
5 min later, another buyer showed up. She also could not pick up but her brother would. She was to pay via zelle.
Be careful with FB marketplace. It's a mess now.