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Totally, but most IoT customers are not homelab hobbyists, so I think its defensible for IoT vendors to just hard code known good DNS in their devices instead of relying on broken ISP resolvers.

Related story, there was a period of time where my ISP's resolver that would replace hostnames with no DNS record with their own ad filled garbage page.

So you mistype google.com to foofle.com or something and instead of getting "host not found" you get... ads.

Disgusting behaviour IMO.