It's going to suck when DoH and DoT becomes more prevalent.
I think the solution is to avoid tech that you don't control. Its a hard pill to swallow for some but at the end of the day there are tons of ways a device could bypass networking restrictions
Best you can do is maintain a list of public DoH IPs and block them. Redirect all port 53 traffic to your own DNS server.
I do a DNS redirect on my Mikrotik router.
It's going to suck when DoH and DoT becomes more prevalent.
I think the solution is to avoid tech that you don't control. Its a hard pill to swallow for some but at the end of the day there are tons of ways a device could bypass networking restrictions
Best you can do is maintain a list of public DoH IPs and block them. Redirect all port 53 traffic to your own DNS server.