> Since the game was mainly targeted at people 12 years old and up, it was important to get right

Let's be honest, this is not important. Even if 12 year olds didn't constantly see/hear/use "bad words", there are really no ill effects of lack of censorship in that way.

It's important for the subscription revenue - which comes from their parents.

Exactly, this wasn't puritanical zeal from Jagex but a realistic decision based on the fact that parents are the ones who control the credit cards.

Then it's even less important to get "right", since the consumers who actually see the results don't care if they accidentally see swear words, and almost any token effort at censorship (a "parental control" option mode, for example) will probably be satisfactory. You might lose some subscribers from extremely zealous parents who bother to read logs and see some stuff "accidentally" get through because the filter is too permissive, but I imagine the vast majority will give you the benefit of the doubt.

Are you a parent? Speaking as one, it doesn't work like that.

One parent sees a dick pic/swearing in a game, they ban the game, tell all their friends and then someone puts it in a school FB group, which is then shared around the country.

(Yes, Runescape was before much of this. That just made it slower, but the same process happens)

The best thing here, I think, would be to create an informational pamphlet kids could print out and give to their parents, showing examples of dick pics and swearing in literally every game imaginable, with the message of "this is just what 12-year-olds do to other 12-year-olds when given microphones and the ability to upload pictures; there is no way to stop this. Even if you ban them from games altogether, other 12-year-olds are just going to swear and draw graffiti dicks in places your child can see at school. Just give up already."