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Unfortunately running your own DNS isn't an option in every context. Not to mention, 3MB is nothing, it shouldn't struggle with that.

Is blocking on a DNS level even sufficient? I'd imagine there are hard coded fall back IPs involved at least sometimes.

A lot of IOT devices (including smart TV's), completly ignore DNS

Easy! Just set router level firewall rules to redirect DNS.

DoH and DoT are slowly changing that, it's getting troublesome to redirect.

It certainly helps, but it's not perfect, no.