How come certain websites are automatically blocked on certain wifi and computers?

[THE TRUE DIGLET]

try accessing porn or specific forums on a public wifi or pc and they get automatically blocked

how does that even work?

I can't see it being blocked manually so how do such sites get detected as ''bad'' and blocked

 

[Fire.]

Britbong trait tbh

 

[Fire.]

I can open up pornhub in best buy