The team will update documentation for clarity. The updated document isn’t ready yet, but they let me know that:
Vercel does not train on any data for AI Gateway for any customers of any tier for BYOK or otherwise. Vercel does not have any plans to use customer content from AI Gateway for any training unless the customer opts-in. As to third-party LLM providers, it is the customer’s responsibility to review and understand the terms for the providers that they select, which are listed in our Notices and License Information (NLI).
I hope that helps!