They are likely actually worse than other electronic learning (which is already bad) because of how human preference optimized they are, same as eating ultra processed food is easy but not very good for you.

If you type "I want to learn CUDA programming. Where should I start?" into Claude, it gives a pretty plausible outline. It's not clear what an app could add to it.

Use case doesn't take off because you need to critically assess what it's telling you and push back if it doesn't make sense.

For more complex stuff, like setting up AWS object storage, it can honestly teach you step by step, that is if you're willing to actually absorb the information.