I have no doubt people test GPT-3/4/J on HN. It's very possible this is a bot. HN and reddit are probably the best mainstream platforms to train and test them.

I have no doubt people test GPT-3/4/J on HN. It's very possible this is a bot. HN and reddit are probably the best mainstream platforms to train and test them. It's easy to automate posting, you have good API access, and you get human feedback in the form of up/downvotes. Contrast against Twitter or FB, which are so full of bots and spam themselves that you wouldn't have nearly as much high-quality human feedback.