Site is not well policed. Some offers are ridiculously underpriced. Are they just collecting emails or phone numbers? Be especially cautious of sellers claiming "My Wallapop . . . is full. Contact me at . . . ", and of anything with a 406 area code (unless you, too, are in Montana, I suppose). For example, there are multiple cars and trucks listed that are supposedly located in central Illinois, but have a Montana phone number and an asking price of 10 cents on the dollar. I dont know if the app developers could do anything about this or not. Maybe they could match location to phone number. Be careful, users.
Farkel99 about Wallapop - Sell & Buy