Didn't OpenAI say something similar about GPT-3? Too dangerous to open source and then afew years later tehy were open sourcing gpt-oss because a bunch of oss labs were competing with their top models.
OpenAI said that GPT-5 was too dangerous to release... And look where we are now. It's mostly hype.
OpenAI didn't release GPT-2 initially because they were worried it would make it too easy to generate spam. Which it kinda did.