You could identify playgrounds that do not have a Wayspot yet - and go nominate something else near them. A statue, pergola, plaque, something. Then if the playground ever is nominated, it might not show up in your game. Or if it does, you’ll have something else to play instead.
Also, if you play PokemonGo, you could add pictures to wayspots that are not playgrounds - so they’ll be more likely to be chosen as gyms.
EDIT to add @xLilPoundcake 's suggestion to edit descriptions to make them more interesting. Maybe the apartment block (whatever owns the playground) has an interesting story that visitors would enjoy reading. The apartment won’t qualify by itself. Or the road that it’s on. Something. How to fight the majority opinion? - #48 by xLilPoundcake