Why can't I see certain images if they have a certain tag?

Title.

Which tag?

Loli. I'm logged in.

Loli is a censored tag, so only users with upgraded accounts can see it https://danbooru.donmai.us/user_upgrade/new

If you're asking why is it censored, I think it was because credit card companies and advertisers don't like it.

Okay. You can delete this account to open the name to someone else then, I have no intention of ever returning in that case.