I use @dustsweeper's service, though @dustsweeper misses a lot of dust votes to be swept due to most of my comments (and a few posts) having dust votes. 🤔 I still really appreciate their service though. 😏
Anyway, since you mentioned @dustbunny, I have delegated 10 Hive Power to them to see how their (already free) service goes to their supporters! 😅