@p @NEETzsche @r000t @graf $ doas -u postgres psql -d pleroma -At -c "select data->>'actor' from objects where data->>'type' = 'Audio' order by id asc;" | sort | uniq -c | sort -rn
6763 https://shitposter.club/users/jeffcliff
5172 https://iddqd.social/users/NEETzsche
2158 https://thechimp.zone/users/thegreatape
894 https://iddqd.social/users/sundowner
517 https://breastmilk.club/users/marine
301 https://clubcyberia.co/users/Inginsub
89 https://clubcyberia.co/users/cassidyclown
53 https://iddqd.social/users/ChristopherBRobin
27 https://ryona.agency/users/mint
11 https://shitposter.club/users/Moon
11 https://bae.st/users/nosleep
7 https://ryona.agency/users/lauralt
7 https://ryona.agency/users/FrailLeaf
4 https://ryona.agency/users/cutemaxxer
3 https://shitposter.club/users/Bajax
3 https://boymoder.biz/users/nukie
3 http://rawrxd4mden7rmbobaftao3qjyxbrvj4rrooehkqxlqcsdtnnn2hndid.onion/users/khayyam
2 https://social.singing.dog/users/Coyote
2 https://cum.salon/users/chog9
1 https://bae.st/users/Pawlicker
Quite a few people use them, it looks like. Obviously this stat is limited to what I have here on Agency, and most of the federation here goes through side channels (relays, etc) so there isn't many activities that aren't plain posts. Some older instance would have more considering scrobbles has been around for years before Neetzsche added frontend support for them.