Exactly how strict is the criteria to get approved for Adsense?

I've been an occasional lurker on this sub and every time I always see posts asking how come their site got rejected from Adsense. I've read through the official eligibility requirements guide and instead of clearing things up its left me more confused. My understanding is that you needed a high traffic site with almost, if not 100% original content & the age of the site should be at least a few months old.

But as a computer science student I've been looking at public APIs (from Twitter, Instagram, etc) & noticed a lot of sites which basically use these APIs to get data (i.e. images, videos, etc) from these social media sites and just re-display them have Adsense ads on them. How are they even getting approved?

Example is this http://www.insusers.com/

Submitted June 07, 2020 at 02:30PM by toosharp4c https://www.reddit.com/r/Adsense/comments/gyod3v/exactly_how_strict_is_the_criteria_to_get/?utm_source=ifttt