Also, if their ISP-provided router got owned by a virus and is now part of a botnet, how is the end user going to fix that? Many of those devices are locked dow

Also, if their ISP-provided router got owned by a virus and is now part of a botnet, how is the end user going to fix that? Many of those devices are locked down. It may not be a problem they can solve without manually configuring every device to use 8.8.8.8, so now every device needs to have a full flow for configuring its DNS servers. I'm personally in favor of every device having that option but it's also the case that the vast majority of people will not benefit from their TVs and lightbulbs having customizable DNS.