Thank you for your answer. You said that this is not possible on the path I'm currently on. Do you know another technique that would help me achieve this result? Is it possible fully on the client side? I would like something close to 100% result but nothing built-in in Swift seem to let me achieve this.

Thank you for the answer. So I understand that from all the solutions provided by Apple and that are built-in I can't successfully block 100% of the time the websites, even with the new NEURLFilter. You said I can't achieve that on this path, is there another possibility to achieve this result?