DNS-based censorship doesn't work well enough for governments to be useful, it's always just a first step towards much more aggressive censorship tech. You should not advice people to use DoH to circumvent censorship, Tor is a decent longer term solution, and so are private VPNs, proxies.

Although I find it suspicious that there is just DNS filtering on your ISPs side and no IP filtering. Is it at the stage where it's not even enforced, semi-voluntary censorship by ISPs? Otherwise once the government starts checking compliance it will force IP-based filtering too, where DNS filtering circumvention is useless. And governments don't care about how broad the filtering is. Russia, for example, blocked half of the internet once in an attempt to censor Telegram.