I'm going to go against the grain here and say that this isn't a bad idea. Mobile Chrome has a similar feature that shows recommended articles on the new tab page, and it is surprisingly good at learning the topics you are into (from searches obviously). I often find new and interesting articles on there, similar to how TikTok manages to know what you like but also tries to give you new topics occasionally. This could introduce people to a lot of content that they otherwise wouldn't discover.
I think calling it "TikTok for text" is the bad idea. Sounds like it's focused on traditional long-form writing not short-form content. The only part of TikTok they're trying to emulate is a recommendation algorithm that doesn't suck (and which every social media site should be trying to do).
I always get clickbait Medium articles and SEO garbage on my Mobile Chrome homepage. There's interesting content sometimes, sure, but the signal-to-noise ratio is very bad. I try to teach the algorithm by dismissing those low-quality posts, but they keep appearing.
