We have been talking about adding this tag only to follow list updates on a temporary basis to try to track down the lost lists problem. We don’t believe it is a Nos problem bc we’re only seeing partial lost lists. 

In general I don’t think it’s a good idea to add these tags w/o user permission but the Nostr ecosystem also needs to stop losing user follow lists. If all the clients added the tag temporarily we could likely pinpoint the issue and stop frustrating users and also wasting dev time trying to figure out if it’s our respective app.