It's a fair reading to suggest that knowing the market is expanding at such a rapid pace, like the growth from 63 to 668 models on OpenRouter, could certainly influence a platform's decision to integrate more offerings.
However, the tracking itself is a measurement of that growth, not its active cause; it's a diagnostic report.
The actual expansion comes from developers creating new models, providers offering them, and OpenRouter's team doing the integration work.
It's like how my network monitoring tool reports that the internet connection is down, but it doesn't break the cable itself.