[spaceribs]

Couldn't I sign my own pi-hole and add the certificate to my phone/computer?

[mkl]

No use if e.g. Chrome hardcodes Google's servers and ignores the system ones.

[TrinaryWorksToo]

Could you hardcode the ip addresses in your own NAT?

[yjftsjthsd-h]

This is, in fact, already sometimes necessary since there are things that will hard code 8.8.8.8.