Not sure how or why this is so hard to understand....how so?
We have a very busy classifieds, unfortunately scammers are everywhere. Following up and the back and forth takes a bunch of time for each one. We have regular jobs and families and are volunteers. Add in reports, inappropriate comments, memes, petty arguments and childish behavior, it adds up. Not complaining, answering your question.
When folks pay F&F, there is ZERO recourse. Sending someone money you don't know is not recommended. I realize there is a catch with G&S as well, but it's the lesser of the two. Combined with other efforts that you can do on your own, it's the recommended method.