Last.fm lookups need a free key. Without one, Last.fm profiles use simulated data so you can still try every screen. ListenBrainz and the Spotify export never need a key.
Create a Last.fm API key. It takes about a minute and is saved in this browser only.
In simulated mode, try the Last.fm usernames hiddenuser, staleuser, newuser and nobody.
hiddenuser
staleuser
newuser
nobody