Transparent DNS proxy is a thing, plenty of ISPs have been using them for more than a decade. I know mine does because occasionally they hit a snag and setting

Transparent DNS proxy is a thing, plenty of ISPs have been using them for more than a decade. I know mine does because occasionally they hit a snag and setting your DNS to 8.8.8.8 wont help because any request over port 53 is silently intercepted. Like somebody said below, this is pretty much a non issue unless google starts to force DNSSEC and certificate pinning.