[gen3]

From what I have heard in the past, Apple has only given them to specific researchers who they trust. It's very much a "We'll contact you" type of situation.

From a more grey perspective, the dev-fused phones do get stolen and sold around.

[comex]

I don't think Apple has ever intentionally handed out dev-fused phones. However, they are planning to do something like that starting next year. [1]

[1] https://www.theverge.com/2019/8/8/20756629/apple-iphone-secu...