This is such a weird take as someone who is on TikTok and really enjoys it. The app is a just mirror for your interests with an insanely good discovery system. Whatever you like and interact with it shows you more of and it tests the waters occasionally to try and find new things you might like.

My TikTok is cooking, home decor, gardening, fashion, makeup, pop punk music, longboarding, bullet journaling, and mental health.

Like you could be right that TikTok will change for the worse maliciously but such a change would kill what makes it worth using.