Okay seriously, how does Amex Fraud Work and why is it so good?

Serious question in the title. I'm not asking because I'm attempting to beat the system by an stretch of the imagination - I'm asking because I've been an amex customer since 2013 and 100% of the times where they've asked "is this charge fraudulent," they've been correct. Additionally, there's been exactly 0 times where they've asked about a charge that I was like "oh this is gonna get flagged." By this, I mean that I've never had issues with random purchases such as a $3800 purchase at newegg, a $2100 next day flight to a funeral, a $260 meal on a trip (which was way out of my normal pattern, I'm taco bell trash, maybe chipotle if I'm feeling lucky), usage in Canada for a week, San Jose and Vegas back to back... all of it was totally approved, but a $11.24 charge to Uber was immediately flagged and put my card on hold. I'm asking because literally chase bank is asking every week "diD YoU MAke a FifTY fIVe dollar pURchAse to GCP fOr ThE 32nd MoNtH in A RoW?" How is the system that good? Are they pulling signals from my social media accounts or something? Edit: no this isn't an ad nor am I gushing. I've just legit never seen a system be so accurate especially considering there's never been charges that have slipped through.