I think it's kind of like what GitHub has despite getting rid of the quota system for Copilot: existing customers that are already setup to deal with them.
In this case I imagine that OpenRouter's moat is going to be that businesses that already use Stripe will have a lower bar to choosing OpenRouter to provide the AI access, and clean integration with Stripe to pay for stuff like AI support bots.
The flexibility is kind of what I'm pointing to, if I understand you right. Instead of dealing with Anthropic, OpenAI, XAi etc directly and having systems to handle user assignment, budgeting etc for each, companies just deal with GitHub, which they've probably been dealing with anyway.
In this case I imagine that OpenRouter's moat is going to be that businesses that already use Stripe will have a lower bar to choosing OpenRouter to provide the AI access, and clean integration with Stripe to pay for stuff like AI support bots.