Sep 23, 2004 here! 285k scrobbles. Always been a loyal user. My use goes back far enough that I would have scrobbles queued up for when my dialup connection came online to push the days’ missed scrobbles up.
I initially moved to it because Shortcuts broke my "generate 2h of music I rarely listen to" shortcut (it stopped being able to add music to playlists - hilarious for an in-house app talking to an in-house app!) and someone suggested Marvis because it has a "dynamic smart playlist" and it also has integrated scrobbling.
You can pretty much replace the Apple Music frontend with Marvis (at least on iOS) and everything works the same (because it's still using Music as its backend.)