You’re missing half the picture here. It’s not the scraping that’s the big problem, it’s what the rest of the TOS say they can do with everything they get from scraping your site. Like use it to train their AI and provide responses to people questions. That’s part is the real legally contentious part, for a multitude of reasons. I imagine they see this as a way of getting around things like Australia’s requirement they pay a fee to news outlets if they show their content. The TOS also says they can create fake accounts on your site, for scraping. Which means if you have anything on your site, that you don’t have full legal rights to distribute and use in any fashion you like, you are at significant legal risk if you continue to use anything meta after 30 October.

I'm not missing anything. I just don't believe that by granting those permissions you're making the legal representation that you are licensing third party material. The request is not worded in those terms, even, just as a consent to engage in scraping and subsequent uses of the material. For those materials that you do own, the consent does amount to licensing. For materials you don't own, the consent only covers the activity of scraping; you consenting to the material being used for training simply means nothing. You have attested that you have no objection to that. That doesn't remove the copyright holder's right to have an objection. All those things they are asking for, any visitor can engage in without any permission, and everyone knows it.

Imagine someone asks you: see that guy across the street? Do I have your consent to search his pockets? If you say yes, what does it mean? Precisely nothing.

Suppose you are asked: do I have your consent to search the pockets of everyone in this neighborhood? If you say yes, it still means nothing with regard to the guy across the street, who has not given any constent, but you've consented to your pockets being searched.