And in the example of "why" this 401 is happening that's another one of those. The spec might have said to return a 401 for both not being authenticated and for not having enough privileges.
But that's just plain wrong and a proper developer would be allowed to change that. If you're not authenticating properly, you get a 401. That means you can't prove you're who you say you are.
If you are past that, i.e. we know that you are who you say you are, then the proper return code is 403 for saying "You are not allowed to access what you're trying to access, given who you are".
Which funnily enough seems to be a very elusive concept to many humans as well, never mind an LLM.
...then there are the other fun ones, like not wanting to tell people things exist that they don't have access to, like Github returning 404 errors for private repositories you know exist when you aren't logged into an account that has access to them.
You’re clearly not paying attention to American politics.