Comment by bastawhiz
I think this is kind of a nothingburger. This reads like a standard clause in any services contract. I also cannot (without a license):
1. Pay for a stock photo library and train an image model with it that I then sell.
2. Use a spam detection service, train a model on its output, then sell that model as a competitor.
3. Hire a voice actor to read some copy, train a text to speech model on their voice, then sell that model.
This doesn't mean you can't tell Claude "hey, build me a Claude Code competitor". I don't even think they care about the CLI. It means I can't ask Claude to build things, then train a new LLM based on what Claude built. Claude can't be your training data.
There's an argument to be made that Anthropic didn't obtain their training material in an ethical way so why should you respect their intellectual property? The difference, in my opinion, is that Anthropic didn't agree to a terms of use on their training data. I don't think that makes it right, necessarily, but there's a big difference between "I bought a book, scanned it, learned its facts, then shredded the book" and "I agreed to your ToS then violated it by paying for output that I then used to clone the exact behavior of the service."
When you buy a book you’re entering into a well-trodden ToS which is absolutely broken by scanning and/or training.