A pay-to-scrape AI licensing standard is now official
theverge.com
theverge.com
it's another robots.txt-like standard, with no teeth, so I'd expect it would be as effective as robots.txt ever was, which is: "every AI will ignore it"
Renting few residential proxy IPs and faking some user agent is way cheaper than paying any fees.
You can't have a new search or open source AI if you can't afford to pay scraping fee's.