I have been a happy Pi-hole user for a year now. The Pi-hole runs exclusively (i.e. no other services run) on a raspberry pi 1b+ connected over cable to my Asus router. All DNS requests are routed through the Pi-hole.
I have recently started observing that the Pi-hole is generating gigabytes of DNS data volume on a daily basis. I cannot remember having seen this behavior in the past; also my parents' Pi-hole only generates a few MB a day. Thinking that I might have broken the raspberry pi OS, I reinstalled it today, updated it, installed Pi-hole and the "problem" is still there.
My question is: is this normal? What is your experience?
Thank you and best regards