> [Willow] lends credence to the notion that quantum computation occurs in many parallel universes
There is nothing illegal about this, but this silly attempt at making the press release seem even more important than it was (which was unnecessary anyways) wound up detracting a bunch of attention for little benefit. (Ultimately, it didn't really matter much: most of the focus was still on the accomplishment, but it's still a pointless own-goal.)
This is basically the same thing. Of course, it isn't illegal to use a term wrong, but it's going to inevitably detract from the things that matter. There's plenty of other words in the English language that can be used in place of the words "open source". Doesn't matter what you choose: source-available, fair source, etc. It's all fine. Just don't use "open source", that's confusing because it isn't consistent with how the term open source is used.
For better or worse, Open source is firmly-established industry jargon by this point. There's little point in arguing about it because right or wrong, we can go 100 comments deep and the status quo will be absolutely identical by the end. It's not worth it.