Pi-hole is OK, but for good measure it's easy to set up a "hosts" file that blocks all that stuff locally. You can use your findings from Pi-hole. On Linux you just pop your entries in /etc/hosts, or other OS equivalent. Here are some curated lists.
For Mozilla telemetry - https://github.com/MrRawes/firefox-hosts/blob/firefox-hosts/hosts
Massive list for everything - https://github.com/StevenBlack/hosts
retrogirl
joined 1 year ago
Posteo has been stable, professional and functional for many years. Tuta is another good choice.
That's a lot of progress! Worth the read.