You laugh, but this is the kind of data that allows you to train models that actually catch a lot of corner cases, as well as generalizing to other 3D applications.

I'm not gonna comment on the morality of mass acquisition of all of this data, but as someone who deals in 3d in the medical/dental space everyday..

there's absolutely no doubt that all of that data is as valuable as gold in research.

On a tangential but related note..

I mean, people in possession of troves of data, especially in the medical or 3D industries, really ought to start understanding the value of the data they're sitting on. You can give it away if you like, but don't be upset when someone turns it into a couple hundred billion dollars and doesn't compensate you.

If you won't like it if tech companies rip you off, then take the legally required steps to protect your data. (That includes making sure you licensed your data properly. And protecting your data with explicit use licenses and, potentially, even access controls.)