

eBlocker does indeed seem German. It’s also much more than PiHole (it MITMs your packets, it seems) https://eblocker.org/en/how-eblocker-works/
eBlocker uses SSL bumping with a unique root certificate to decrypt possibly encrypted TCP/IP packets. After this deep packet inspection a pattern matching to the target URI is performed. In case of a match, the request is answered by the eBlocker (instead of being sent to the target URI).
As a slightly less accurate alternative, eBlocker uses DNS blocking for fallback, where the domains of known data collectors are blocked. This way, even devices that do not allow to install root certificates are also protected.

Some are, but others don’t currently meet the requirements for adoption