Death of Flickr in my opinion. Plenty of other options for paid services for showing off photo collections and Flickr has been dying for a while in terms of creativity. Just bucket loads of HDR, professional promotion and group spamming. Viewers and comments of any use dropping off.
I don’t use it at an mass archive, just for stuff I want to share, but the albums I’ve got on there have built up to 2000+ photos. I used to be on a paid account but it didn’t give me much benefit and then they did the large free storage so I dropped it.
I get little from the critical review side of it now and I don’t have the time or desire to browse other’s photos due to many I’d follow giving up on the place. So it just becomes a place to have my photo albums to show off. I can already do that with OneDrive, create and share albums as I need (and similar price you get 1TB storage and Word, Excel etc with Office 365).
Will probably delete my account rather than have half the photos ripped out.