Three things. For one, I have no reason to take them at their word that they aren’t saving data to train on. Two is that OpenAI will shut down one day, and thus I would like any services I run to outlive them. Third and finally, I have hardware and it’d be a waste not to use it. As a bonus, I find it hypocritical a company that benefits so heavily from open source would hide away their models as closed source in fear of copycats.