Quote from their own TOS: access the Site or Service for purposes of reselling API access to AI Models or otherwise developing a competing service;
When you say "you don't have the right to do what you want with the API Key" it makes it sound like specific use cases are disallowed, or something similar. "You don't have the right to go against the ToS, for some reason they block you then!" would have been very different, and of course it's like that.
Bit like complaining that Stripe is preventing you from accepting credit card payments for narcotics. Yes, just because you have an API key doesn't mean somehow you can do whatever you want.
Are we allowed yes or not to make a service that charge per Token to end-users, like giving access to Kimi K2.5 to end-users through Openrouter in a pay per token basis?