Last.fm is built around scrobbling: it automatically adds plays from many music services and players to your profile, then turns that history into stats, charts, reports and recommendations. If you want the fullest possible ledger of what played, that is the specialist tool.
Raygum can privately record connected Spotify history when you opt in, but it is not pretending to match Last.fm’s scrobbling reach or statistical depth. Its reason to exist is the meaningful layer a play count cannot supply: your rating, your note, your Listen List, your collections and the context behind a record.