in Britain there is the so called "snoopers charter" or otherwise known as 'investigatory powers' that forces all ISP's to log everyone's DNS QUERY REQUESTS so that the government can either intercept the contents of the requests to redirect the user to a government block-page instead of the legitimate site or simply to dump all of the requests to a log file.
TYPICAL DNS QUERY & RESPONSE www.duckduckgo.com -> [184.108.40.206] simply encrypting these queries allows you to take back control over the internet, if they can't see the contents they can't conduct mass surveillance. this also means that they cannot block access to websites since they cannot modify the request since they can't interpret it, any attempt to modify it would likely break it. they use fear mongering to intimidate the public into believing that somehow the government can catch you online no matter what you do. this is false and it is very telling that you can be arrested in Britain for failing to comply with decrypting your own device as obstructing the course of justice.
DNSCrypt could also be enough to stop your ISP from logging and modifying DNS Query Requests and Responses, there are also other more advanced networking setups you can use to bypass more advanced forms of censorship such as bypassing deep packet inspection by using obfsproxy, Secure Socket Layer (SLL), and ShadowSocks.