My ISP (one of the largest in the US) like to hijack DNS responses (specially NXDOMAIN) and serve crap. No thanks. Which is also why I have to use encryption to talk to public DNS servers otherwise they will hijack anyways.
My ISP one got kicked to the curb once they started returning results for anything including invalid sites. Basically to try to steer you towards their search.
Agreed in principle, but has anyone seen any practical difference between these DNS services? What would be a more detailed downside for using these in parallel instead of the ISP default as a fallback?
Some of them are so privacy-preserving they block sending your own location to the original DNS server, which makes anycast not work, so you get slower connections to the site.