saying "if you don't like it get an interview elsewhere" is pretty unhelpful, because that's pretty much what he did; refused to continue with the current process. it also doesn't really work in the real world, because nothing would ever get fixed. if there were awful terms in a license agreement and someone found out, it's all well and good to say "go somewhere else", but what if it's in something like, say, windows that many people are forced to use for various reasons. sure, you might be able to go somewhere else but the practice still needs to be criticised and shown to others

> How is that different from being recorded by multiple cameras during an on-site interview?

I'd refuse this too. But the difference is that the on site one isn't a massive security threat.

>while clearly telling you upfront what kind data will be collected

It doesn't even satisfy the legal requirements for informing people their personal data is going to be collected (in my country at least). They don't tell you what happens to the data, who has access to it, they don't provide a way to let them know you want it deleted, and so on.