So it must be the lack of ads, cookies, and AI generated content which makes Google suspicious of it

If your site isn’t integrated with Google’s Adsense infrastructure it is immediately at a disadvantage as Google won’t scan your site anywhere near as often, and even when it does will put the results way below anything else that does. It’s not that it finds your site suspicious, it is simply incentivized to really look hard at all the other sites paying for service.