Changing the default settings wouldn't mean changing any individual user's settings. It would mean changing the default settings you get the first time you login. Which the user could then change to their preference.
If you have a bunch of elderly/non-savvy people who are using your server, being able to change the default settings to something sensible for that set of users would be a good feature to have.
Not to be a buzzkill, but lemmy.world has a rule against posting links (even obfuscated links) to pirate sites. You may want to edit that post to at least remove the TLD.