So I’ve spent a few minutes trying to see what the internet thinks, and it looks like there’s not a clear consensus that the First-Sale-Doctrine applies to non-physical goods similarly to physical ones, and does seem to be a consensus that digital goods make it a lot messier. Seems like the law hasn’t caught up to technology, still.
And in absence of clear law, it makes sense that companies are making their own opinions, and unfortunate that some are being greedier than they could be.