Dataloom is still in the plugin store, but its last update 2 months ago added a message to the description saying it is no longer maintained and that users should migrate to something else. This user only found out today:
Hey folks, just wanted to mention how outdated I’ve been in the plugins thingie cause I found out I’ve been using a deprecated plugin 2 months after it was killed (Discord)
This is a different case from that described in the feature request, but related, and for the end user very similar. A standard way to notify the user of this would be good.