Whatever the cap is, I’m sure it’s a lot higher than google will let you do before they start rate limiting you or making you do a captcha for every search. Pretty much all search services have some cap, after which they will put up roadblocks to slow you down
When trying out Kagi (prior to unlimited searches) my monthly Google searches were significantly higher than the cap. While some definitely do get CAPTCHAs, I wasn't. Adjusting this to the new unlimited price and it would still seem to be negative profit for them, hence the question.