system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does Google know/decide which search queries are 'inappropriate' (pornstar names etc.) and to stop trying to auto-complete them?

Example: Suppose you want to look up Asa Akira. She's ranked as the number 2 pornstar on Pornhub, so you'd think there would be plenty of searches for her. However, typing in "asa akir" doesn't auto-complete to "asa akira" even though that's obvious what you're looking up. How does Google know/decide to NOT auto-complete that search, and why? Note: SafeSearch is off.
gpt
Since Google can see what links you click on from their page, their system can notice that searching "Asa Akira" (nice choice BTW) tends to lead to pornographic sites. Using this information, they'll decide that the term indicates a desire for pornography and they won't put it in auto-complete. It's fine if you want to search it, they just aren't going to *suggest* it to you - same for other NSFW or objectionable content.