Potentially higher cache hit rate at the expense of your data being kept for training.

Yes, openrouter providers are all over the place (in a bad way): https://mmoustafa.com/blog/so-you-want-to-use-openrouter/

I've experienced this firsthand and now I generally pin to providers that I trust on openrouter, or just pony up and pay for the real thing.

platform deepseek com's tos enforces use all your data on training, which is a major set back for me.

Other than that, I think they are cheaper last time I compared.