If it is known, then it is copyright infringement to download the training sets and therefore a crime to do so. You cannot reproduce a copy of the works without the express permission of the copyright holder.

How many computers did Midjourney copy its training weights to? Has Midjourney (and the IT team behind it) paid royalties for every copyrighted image in its training set to have a proper copyright license to copy all of this data from computer to computer?

I’m guessing no. Which means the Midjourney team (if you say is true) is committing copyright infringement every time they spin up a new server with these weights.

Pro-AI side will obviously argue that the training weights do not contain the data of these copyrighted works. A claim that is looking more-and-more laughable as these experiments happen.