Flickr recently announced some changes to their free account offering, in a blog post Why we’re changing Flickr free accounts Flickr announced “Beginning January 8, 2019, Free accounts will be limited to 1,000 photos and videos. If you need unlimited storage, you’ll need to upgrade to Flickr Pro.”
If you have a free account on Flickr and have more than 1,000 images, Flickr will start deleting them for you in February until you are down to the new limit.
The Flickr blog post also states something that is a tad misleading “It’s also more closely aligned to Flickr’s past (before 2013, Free members were limited to 200 photos), and we liked the idea of returning to our roots but with free space for five times as many photos as before”.
This isn’t strictly accurate, whereas only 200 images would appear in your photostream, you were not restricted to 200 images, the images were not deleted, they could stlll exist in groups or remain embedded on blogs and forums and if you upgraded to pro you would be able to freely access them again. This actually acted as an incentive to go pro, the curtain would be withdrawn from your Flickr photos and everything would be there.
An unfortunate set of circumstances have led to this situation, the main one being Yahoo’s ridiculous 1TB of free storage offer back in 2013. That really devalued Flickr pro, but it also encouraged people to freely upload.