Your second paragraph, the more you talk/click on a content, the more frequently it'll show up, yeah.

Many social media sites do this to some degree but TikTok's algorithm is very extreme.

This reminds me of Elephant No. 2.

You’d think TikTok would be just as susceptible to Apple’s privacy change as Facebook. After all, TikTok’s ads are fueled by an algorithm, which is fed with your data. But research suggests TikTok is more insulated against Apple’s privacy change than others. According to cybersecurity experts, TikTok can circumvent Apple’s code audits and track activity without the user’s knowledge. Exactly how this works is (again) not so clear, and that’s the point — as one expert pointed out, “ByteDance has gone to monumental lengths to conceal the inner workings of the app.” What could go wrong?