I recently implemented DNS-level ad and tracker blocking on my home network and got a notification from Comcast saying some of my services might be affected by a "misconfiguration" of my non-Xfinity equipment. They even offered to send out a tech. I told them no.
The only services that aren't working on my network so far are their trackers are and ad partnerships.
I'm trying out NextDNS but I’m open to other recommendations if anyone has them.