Meta Platforms Inc. has joined Elon Musk in his efforts to block OpenAI's transition to a for-profit company.Meta argues that OpenAI's transition would set a dangerous precedent, allowing startups to enjoy nonprofit benefits until they become profitable.OpenAI plans to maintain a nonprofit arm while the new for-profit entity would enhance its ability to pursue its mission.Elon Musk and Meta support each other's legal challenges against OpenAI's transition.