Interesting, I don’t think that’s incredibly common but that’s certainly not good news for them. And also not great for OpenRouter.
Vendor lock in is quite well understood, most larger companies (the one's I have worked with anyway) are aware of the risk and take steps to actively avoid it. Once bitten, twice shy.
Openrouter is really meant for individual developers and startups.
Openrouter was acquired by stripe, I'm sure they're not worried.