[abc-xyz]

Pinterest’s user-base is surely minuscule compared to the amount of users using Google Image Search.

I’m not saying that 100% of all users with a Pinterest account use their website/app, but many of them will of course opt to use Pinterest’s website/app for their image searches, which means an even smaller percentage of the Google Image Search users will have a Pinterest account.

[FireBeyond]

Not just Image Search - Pinterest often dominates Text Search, and people here are "Oh well, they figured out how to deliver what Google wants!"