I thought of pi-hole but I’m not sure it is dead simple. I’m thinking a box that your incoming internet connections connects to and an outgoing connection to your wifi router.

The market probably isn’t big enough yet, but I’ll bet it grows. I mean _Texas_ is bringing it up!

I tried using a Pi-hole for this exact reason: prevent bullcrap TV ads. My Roku TV wouldn't stopped working. I had to whitelist so many roku-related domains that it basically became pointless.