Google Maps app sees that you took photo near POI and later in the day asks you in notification if you want to share it on maps.

You review the photo and go "lol, sure".

At least for me that doesn't even feel like posting due to how frictionless it is and that it's about natural discoverability (someone has to click that POI and scroll through photos to find it).

About the latter: that's why Google Maps is my favourite social medium. It's hyper-local.