ISPs want to sell advertising, or data to advertisers. Why bother trying to advertise to a few geeks who are probably running PiHole anyway? Especially since doing that multiplies the hardware requirements 100 fold.

True, although what are they going to do with the data? If it’s primarily for selling to ad companies, a tiny slice of privacy minded people aren’t worth much.

Err, snooping on a teen visiting "naughty" sites isn't exactly interesting from any perspective.