I have some passing awareness of Flickr. I worked a while at 500px. What I heard at the time was that photographers put their good work on Flickr, everything in

I have some passing awareness of Flickr. I worked a while at 500px. What I heard at the time was that photographers put their good work on Flickr, everything into Google photos, and their best examples on 500px. I also remember (IIRC) that Flickr did a site redesign going white background rather than the 'light table' black background. I'm not their target user but that would have ended it for me. My conclusion would be that Flickr could have co-existed with Google photos serving a more active/engaged audience but not if they want to have the same brand (most used, approachable white background, etc).