like for example, after writing this comment I just tried creating a new account again (using my facebook to login).
Half the videos are in dutch for some reason (I'm from Denmark, I don't speak dutch nor have I ever lived there). I tried searching on some topics that interested me, and found some of them pretty compelling. Then I went back to the feed, and it just kept showing more dutch content.
Every time I've tried tiktok it's more or less been like this, except with less dutch.