"keyword lists"
I wanted to cover this, because I'm seeing a bad faith British individual talking as if this is some sort of silver bullet or panacea for society's ills. In practice though, if you actually have familiarity with how systems work, you will know that this will run into a mountain of issues and be of questionable efficacy.
One classic issue someone might run into is the Scunthorpe Problem (which is ironically coined after an algorithm kept finding apparent "profanity" inside the names of locations in the U.K., such as S|cunt|horpe (Scunthorpe) and Penis|tone (Penistone), the | is there to make it easier to see how the algorithm read the words). One incident in the U.K. even had the mail filters of MPs reject emails discussing legislation regarding *sexual offenses*.
Another infamous example was when the abbreviation for Combat Power (CP) in the popular game, Pokémon Go, was presumed by an algorithm to mean Child Pornography (CP), and content was subsequently censored.
https://en.wikipedia.org/wiki/Scunthorpe_problem
https://tvtropes.org/pmwiki/pmwiki.php/Main/ScunthorpeProblem
You can read more about the general issue here.
Naturally though, you have people wandering in, ignoring all these past issues, and thinking they know better, complaining about why someone hasn't done something supposedly "simple" (which is not necessarily effective).
Someone also has to think of the context. Someone has to be able to discuss a subject without being at risk of being arbitrarily censored.
There is also silliness where someone gets mad at websites which deal primarily in fictional content without actual actors because of some silly keyword. Also, there was one where a weirdo at an American finance firm looked through the lens of his machine translator reckoned someone's joke about "abuse" in a foreign language must mean that something evil is going on and entire foreign equivalents to YouTube need to be shutdown.
