“DoH means that Firefox will concentrate all DNS traffic on Cloudflare, and they send traffic from all their users to one entity. So what does that mean? It means people outside the US can now be fully tracked by US government: now some of you might wonder if this is actually in line with GDPR (The EU General Data Protection Regulation). It is indeed very questionable if DoH is rolled out as default, since users do NOT opt in, but have to opt out.”
How is Cloudflare’s reputation regarding privacy and security?
not good.
I sorta answered this question in Ember2528’s post. In essence, I don’t know, but it doesn’t matter. If you want to hide DNS queries from your ISP, you should be using TOR.
EDIT: Also, if you’re outside the US, you’re now trackable by the US government.
Check this out: https://www.reddit.com/r/privacy/comments/41cb4k/be_careful_with_cloudflare/