finn, 
#PiHole serves me really great for blocking DNS queries related to advertisement, tracking and unwanted or malicious hosts.
If I use the internet alone the block rate is about 0,1% because I only use #FOSS software, #uBlock and #PrivacyBadger.
But if someone else with a "normal" phone is using the internet, too, PiHole has to block 8,1% of all queries!
I am still responsible for most of the traffic so just image the percentage if all clients were normal non-FOSS tracking devices!
