Using an alternative DNS server won't necessarily save you from DNS-based censorship. The ISP can modify any DNS traffic they want. I actually had an ISP once

Using an alternative DNS server won't necessarily save you from DNS-based censorship. The ISP can modify any DNS traffic they want. I actually had an ISP once that redirected all 53 port traffic to their own DNS server. It was "fun" every time this DNS server went down.