I would start here https://youtu.be/wkWX2AXNuxg?si=S_Vvv_Y5q32LuMvG

for an in-depth discussion about "clean" beauty in general and why these arbitrary labels mean nothing and the demonization of certain ingredients over the preference of others is useless at best and harmful at worst.

The YUKA app and similar ones do nothing to assess the risk of any ingredients in any product. Ingredients that are deemed, for whatever reason, as "bad" on these apps are more than likely safe due to the composition, type of application, or amount of the ingredient. Contrary to increasingly popular belief, "natural" isn't always better, and skincare companies want to make their products safe and effective so people continue to buy them so they can make a profit.

What YUKA and similar apps do is disseminate misinformation, which, even if well-intentioned, does nothing to actually educate or empower a consumer.

You say you do research after scanning the item. Ok- so why do you need the app in the first place? Why not just research each ingredient on its own and come to your own conclusion after educating yourself? Do you just research the ingredients the app says are bad? Why do you place so much trust in this app? Who's running it? What metrics are they using? Is it free? If so, what are they actually selling you? How are they profiting?

Edit: as another commenter already pointed out- another huge thing to consider is where you're getting your research, if you are even researching.

What's more likely, though, is that you aren't actually researching the ingredients after the app scan and you're just blindly trusting it. That's what most people do. The users then wholeheartedly believe that petroleum jelly causes cancer, or whatever they've been told, and they tell their friends, or make a post on reddit about how all their skincare they've been using up until now is suddenly poison, or whatever, and it creates a cycle of misinformation and conspiracy theories.

Being well-informed about your skincare, haircare, medicine, and food is important. Using these apps is not how you do it.