Hi and welcome.
Running the Light list (
https://raw.githubusercontent.com/hagezi/dns-blocklists/main/adblock/light.txt) and noticed a huge variation in the number of domains showing blocked. I don't look every day, or even every week but it's currently showing around 85k on my Pihole when I'm sure a few weeks ago that was up at the 120,000 to 140,000 number.
Why such a variation?
Or am I imagining it? (this is quite possible).
Not to speak for Gerd, but until he gets here... The lists are constantly being tweaked and optimised. He recently removed 1Hosts from the sources list, without losing efficacy. He's
just done another re-adjustment (hence the lower domain count), but again kept the blocking ability. Having read through the lists themselves for some months now, there were some opportunities around de-duplication, amalgamation etc. Especially in the adblock format lists. It seems he's been busy.
If you check your logs, you'll see there's nothing missing that used to be there. My own stats haven't changed, for sure. As an aside, he is always active on Github and you can get almost immediate responses for black/white listing and questions etc. One of the most approachable and responsive devs I've ever dealt with, tbh. He really cares about his lists (and it shows).
TL,DR: Optimisation.