[bkruse]

Having used tiktok for a total of 10 hours now, I get programmer humor, car videos and funny animal videos - exactly what I want

That's the whole point - the ability to curate content that you will like is phenomenal, especially given the non-obvious inputs to their model. Like a video? Sure you'll see more of that kind of stuff. You may not think about scrolling up/down to restart the video, watching it multiple times, sharing it, opening/closing the comments (and I'm sure 10,000 other inputs) all feed into it's ability to curate