TL;DR: for a whole decade YouTube allowed a copyright troll to claim all the rights on a recording of a washing machine end cycle chime

The account of the copyright troll is still standing and it's not permanently banned

IMHO in this case YouTube should permanently ban at the first offense any copyright troll that maliciously claim as their property something that's in the public domain

Also: if it wasn't that it affected a big streamer with lots of followers, YouTube would have ignored the problem