I had a delicious experience upgrading a Windows10 laptop.
I needed to uninstall something, and it chuntered on for a few minutes,
and then the progress bar went *backwards*. I have never seen this
before. I fell into an inescapable mental loop on the nature of time.
As for pi-hole, it seems to be imperfect, at least for this average moron blundering around.
Maybe TLS has something to do with a rather laggy effect
on my machine using a pi-hole for DNS. And it doesn't kill youtube-adverts, so it is not sufficient.
But it could well be part of a plan to de-crap one's internet connection.
At the very least, it is a learning tool. It sheds a lot of light on network shenanigans that go on
on your computer.
Although kitz.co.uk & co (good-guy sites who use unobtrusive ads, and deserve whatever they get from advertising)
are whitelisted, it seems (with no systematic experiment), to show in some browsers and not others.