To add a voice of skepticism. The recent rush to open source these models may be indicative that the tens of millions that’s spent training these things has relatively poor roi. There may be a hope that someone else figures out how to make these commercially useful.
Maybe training it is not that expensive? I know from practice that it takes a really really long time to train even a small nn (thousands of params) , so you'll need a lot more hardware to train one with billions... But, it's expensive to buy the hardware, not necessarily to use it. If you, for some reason, have a few hundred GPU lying around, it might be "cheap" to do the necessary training. Now, that's not your poi…
Not to nitpick, but that is like saying that if you have a Lamborghini lying around, a Sunday trip in one is not so expensive.