In a different world maybe, but I can already see the headlines, “Mozilla open sources lackluster AI tool”. PR is unfortunately a thing, and once you miss that initial wave of interest, you’re unlikely to grab attention later without another marketing push. Mozilla is experienced in open sourcing software, so by now they’re pretty good at knowing when to do it and when not to. In other words, it says something that they chose not to do it in this case.

So risk someone else beating you to market? And they'll either have the resources to make it superior, therefore making yours irrelevant, or they'll make it inferior, which generates bad press for you?