That's not as bad as it looks like:
Comment from chillly on 13 March 2017 at 16:01
I've already found one example following this and adding a 'Little free library' on a road node.
Comment from -karlos- on 13 March 2017 at 17:35
Just a Node?! We coud ask the editing user for a proving picture - changeset comment or user message.
I assume, it wouldn't be dificult to monitor such activities
Comment from Nakaner on 13 March 2017 at 22:46
thank you for the link.
You could use the Overpass queries given in my entry in the German OSM Blog to search for recently created/modified parks.