That's because Facebook is selling your data and access to advertise to you. The better AI gets across the board, the more money they make. AI isn't the product, you are.
OpenAI makes money off selling AI to others. AI is the product, not you.
The fact facebook release more code, in this instance, isn't a good thing. It's a reminder how fucked we all are because they make so much off our personal data they can afford to give away literally BILLIONS of dollars in IP.