Soooo.....
I suspect that @Gargron has just given up on any sort of anti-harassment for mastodon.
The newest release candidate has an update that will let people know they are blocked when they view a profile.
This is fucking basic shit, you don't let harassers know if they are having an effect, or if they are being heard or not. Why the fuck should someone I block get to know I blocked them? It just means they know 1) They had some effect and 2) The need to find a new channel for harassment.
It looks like this has been resolved. A pull request that reverts the changes got merged.