Flickr has released "Update on Creative Commons Licenses and 'In Memoriam' Accounts."
Here's an excerpt:
When we recently announced updates to Flickr Free accounts, we stated that freely licensed public photos (Creative Commons, public domain, U.S. government works, etc.) as of November 1, 2018 in excess of the free account limit would not be deleted. . . .
In this spirit, today we're going further and now protecting all public, freely licensed images on Flickr, regardless of the date they were uploaded. . . .
In conjunction with this announcement, we've disabled bulk license change tools in the Settings, the Camera Roll, and the Organizr for Flickr Free accounts. . . . Any member (Free or Pro) can still change the license of any of their photos on the photo page.
In memoriam accounts will preserve all public content in a deceased member's account, even if their Pro subscription lapses.