They get paid the same either way, Openrouter takes their cut and passes it onto the consumer. And anyone with an Openrouter account has already escaped from their proprietary moat. So for those who have expressed a clear preference for provider-agnostic model infrastructure, do you want to just wall yourself away from them forever?

And per the rankings [0] 18.2% of the tokens sold through went to OpenAI [1]. 3.8% for Anthropic though. Google's up there at 23.4% primarily because GCP/Vertex/whatever they're offering is a billing nightmare and the only way to set a hard cap and sure you won't wake up the next day with a $10k bill is via OR.

[0] https://openrouter.ai/rankings#market-share

[1] Although gpt-oss 20b and 120b are indexed as 'openai' because they're the creator even though they don't serve gpt-oss via openrouter. But neither are in the top 20 of models this month, while Luna and Sol are.