American-style words are really hard these days. I thought 'open' meant source code is available, but at some point, starting with OpenAI, it seems like 'open' has come to mean 'we'll open your wallet.
The ambiguity of the word "Open" has a long history. Going back to at least late 1980s, when X Window "skin" OPEN LOOK (by AT&T - Sun consortium) had license issues and Open Source Foundation started work on OSF Motif.
"open" is simply a vague word that you are assigning more meaning to than it actually means.