I think that something like this is basically inevitable for most free offerings that deal with data storage.
We saw something similar planned by DockerHub because there were a lot of abandoned container images, GitLab briefly wanted to do something similar to dormant projects and I'm sure that there are plenty other cases like that out there.
That said, this always comes with quite the backlash, so quite possibly it's better to bake in data expiry and cleanup from day 1 if you can get away with it.
Personally, though, I think that more people should host their own Mattermost, Rocket.Chat, Nextcloud Talk or other chat solution instances.
We saw something similar planned by DockerHub because there were a lot of abandoned container images, GitLab briefly wanted to do something similar to dormant projects and I'm sure that there are plenty other cases like that out there.
That said, this always comes with quite the backlash, so quite possibly it's better to bake in data expiry and cleanup from day 1 if you can get away with it.
Personally, though, I think that more people should host their own Mattermost, Rocket.Chat, Nextcloud Talk or other chat solution instances.