@mmotti: Very interested in your script, duplicated it and ran it on my pihole. The result: gravity list was reduced from 623959 to 598710. This is a great result, I wonder what the result would be if this method would be applied to users, running this solution?
Would you be so kind to share your regex.list? As I mentioned in another topic, I found this list on reddit.
@DL6ER: I'm NOT a Linux expert, nor a regex expert, but this looks like something that should be part of pihole, further reducing the size of the gravity list...