IMO it's the other way around – because OpenAI doesn't focus on any particular market, they'll be launching stuff that later will be easily reproduced by market leaders that have not only know-how, but they have the whole platform where the AI can be easily added.

What kind of big company will abandon Marketo because OpenAI launched an agent? OpenAI misses everything else that Marketo has, so they'll just wait a few months until Marketo adds the same feature