FB is also had the most scams. People are constantly making new/fake accounts and getting people to pay with unprotected methods. You'll even get series of them giving each other "vouches" to look legit. There is no protection there.
BF has more rules/requirements so is harder to get scammed. It is easier than reddit, but reddit also has better protection. If you think BF is hard, lolol never try knife swap on Reddit.
Ultimately it's a series of decisions on tradeoffs between protection and ease. Protection adds burden.
If we're giving opinions I'd say BF still leans too far towards ease. (Easy for me to say not being the owner or a mod.)