Are you genuinely asking? To pay your taxes, order items online, access your bank account, log into your favorite AI service, there are very often CAPTCHAs involved. Try going a month with CAPTCHAs blocked in uBlock Origin, and you will find yourself unable to do many basic things.

Even besides services you might need to access, as pointed out in another response (e.g., banks, shops), how are you going to check the veracity and understand the context of the information you seek without going to the (possibly hallucinated!) sources? But I guess a lot of people who are into using AI like that just don't care.

Where do you think the AI gets this information?

They also need to browse the web, and are more likely to be blocked by these measures than humans