/u/Master_Disaster4946 on I listed a free couch on marketplace and the fourth person to message me asked me to pay them $20 to come take it

Wait 5 sec.

Idk if you've ever sold anything on fb marketplace, but people flake all the time and don't show up to collect. It's common practice to line up an alternate or two ("oh it's spoken for, but you can have it if they don't show up"), just in case