I was thinking about this issue. Once this feature is on by default, all Firefox DNS query goes through the Cloudflare, a for-profit company which resides on US whose government is infamous for spying everything.
My conclusion is, what's the difference?
Currently, Cloudflare is one of the major CDN in the world and most traffics goes through them.
Even worse, by it's nature, Cloudflare and most of the CDNs are practically doing MITM attack so they can cache the data. For that, HTTPS isn't that secure the most browser vendor want us believe to be. The rise of CDN cause serious single point of failure but most of us don't worry about it like DNS.
To solve this problem, we need to invent completely decentralized new network that doesn't relies on the current Internet even at the physical layer. Probably fallback to the level such that we carry storage by foot or pickup dead drops.
My conclusion is, what's the difference?
Currently, Cloudflare is one of the major CDN in the world and most traffics goes through them.
Even worse, by it's nature, Cloudflare and most of the CDNs are practically doing MITM attack so they can cache the data. For that, HTTPS isn't that secure the most browser vendor want us believe to be. The rise of CDN cause serious single point of failure but most of us don't worry about it like DNS.
To solve this problem, we need to invent completely decentralized new network that doesn't relies on the current Internet even at the physical layer. Probably fallback to the level such that we carry storage by foot or pickup dead drops.