It's immoral to steal someone's research. Quite sad that you don't believe that.
At worst what OpenAI did was inconsiderate, but not referencing prior work is a minor academic sin. This is especially the case when AI is not playing the vanity game that seems to so inflame some mathematicians.
We could also acknowledge that everything that could justifiably be considered stealing is not necessarily covered by current statute.
You seem to be a little sensitive about the subject. Which AI firm do you work for?
I don't work for any AI company.