I just noticed a similar ad on FB Marketplace for a $5000 Motobecane. I sent the guy a text that, given its rusty condition and missing seat, it's probably a $200 bike at best. I did it in a pleasant manner and he appreciated me helping.
He's a scrapper and mentioned that if nobody bought it, he would sell it for scrap. Steel prices are down, so I bet the yard would give him $10 to $20 at most. I hope someone can work out a deal with him.