I fail to see what any of that has to do with knowing who the person is. You might be right, though. As I mentioned, those benefiting from these things will obviously protest it.
Again, it's possible to have an anonymous candidate you can talk to. Voice obfuscation, prohibited questions (to ensure anonymity, etc.) There's nothing inherent in needing to know who the person is. If you disagree I'd love to hear some scenarios.
Sure it's more difficult to do so, which I agree with. However, the only people who will claim that as a reason NOT to do this will be people who are benefiting from how the system is already, or have something else to lose. The dollar amount to implement this is trivial.
If you've ever been to any of those anonymous chat rooms, that's an example. You could then conduct a full interview that way, and have an independent third party source check all of the credentials. Boom. You're done. This whole thing can be implemented with a standard application form (to initially remove identifiers such as name and school) and a Slack channel.
You don't see how meeting a person would remove some of their anonymity?
Or when you say anonymous do you just mean we can't know who the person is by name? But we can meet them, talk to them, etc...