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
That's it! When I grow up I won't become an astronaut or firefighter. I'm going to become a copyright troll!
I recommend people to read the comments in that thread, too. A lot of them are rather insightful; they get it - the problem is not just Google being a cheapstake, but also the copyright laws themselves.
This one is IMO specially insightful:
Yeah the DMCA really fucked things up for creative work. It’s way too easy to take down things you don’t like fraudulently.