They are likely accessing Claude via a VPN. Doing model training work over a VPN is a highly suspicious signal, and likely triggers Anthropic's classifiers. It's not surprising that their account got flagged.

I ask it questions about large models like big MoEs all the time. I’ve never had it refuse a question, but I would expect it to refuse sometimes.

For training data from existing models I just get open models to spill their guts. It’s fine

In industry we train employees to not reveal proprietary information.

I think it would be easier to do this for a model than a lot of employees