Why can't we just go with Occam's razor, and assume that they really believe in their mission of providing access to frontier AI as freely to the world as possible?
But you're going to find it hard to persuade others because of the current zeitgeist and that humans seem to prefer a doom/villain story.
OpenAI is suspiciously bad in providing access to their models, compared to e.g. Meta, Mistral, BLOOM collaboration, Alibaba and even oil tyrants FFS.
Occam's Razor, duh.