At the peak of its popularity, Flickr was an interesting glimpse of the coming age of algorithmic homogeneity. In the mid-2010s, most of their top photos looked basically the same: heavily shopped, oversaturated HDR landscapes.

I stopped using Flickr around the time they started flirting with bait-and-switch strategies - "we'll hide / delete your old photos unless you pay" - so maybe things have gotten better... although I see that artificially-looking landscapes still dominate their "trending" page (https://www.flickr.com/photos/tags).

Anyway, my general takeaway is that things are more interesting on photo sites where engagement isn't driven primarily by a global popularity ranking. You just come across thought-provoking work more often.