The discovery tab (For You) is awesome. Its the first social app where the discovery tab is better than your feed, so much more that you can actually use it without following anyone. It's quite addictive too, you can easily spend half an hour watching videos.

The way the discovery tab works also created a meta game: Alt TikTok, Deep TikTok, Elite TikTok, ...

The exclusivity aspect is there too, very few users are over 30, but it's not the driver.