Don't. It won't help or teach them a lesson. It will only make you lose some self-respect.
If they really have the commitment to run that instance for years, and to organise a proper successor one day when they don't want to do it any more - that would be growing the Fediverse. But if they abandon it after x years, they would be harming it.
Why set up a Lemmy instance instead of creating a community on an existing instance?
Now you have to worry about hosting costs, domain renewal etc.
Please elaborate
Maybe not as simple as a one click install, but you can block things at DNS level using your hosts file
The question for me is if Privacy Badger does something that uBlock Origin doesn't
It does provide for the possibility of future legal action. This should have been done a year or two ago