"They" is me, genius.
Then maybe "they" should take action and don't provide a public rsync service, if "they" consider it abuse?
Is Nico still on board?

EDIT: while I have the attention of "they"...
bash-3.2$ rsync -av rsync://main.aminet.net/aminet .
receiving file list ... done
dev/lib/termcap.readme
game/misc/trackerheroaga.lha
game/misc/trackerheroaga.readme
game/wb/snakee.readme
sent 10833 bytes received 3869115 bytes 596915.08 bytes/sec
total size is 52962935593 speedup is 13650.42
bash-3.2$ rsync -av rsync://main.aminet.net/aminet .
receiving file list ... done
dev/lib/Termcap.readme
game/misc/TrackerHeroAGA.lha
game/misc/TrackerHeroAGA.readme
game/wb/Snakee.readme
sent 10839 bytes received 3866166 bytes 704910.00 bytes/sec
total size is 52962935593 speedup is 13660.79
bash-3.2$
The above is running on a mac that has "case obnoxious" HFS+, but still I suspect these duplicates with different cases on main.aminet.net are unintentional and unwanted.