It's true that keeping tabs on model growth can be useful, but to claim this specific tracking directly informs OpenRouter's model expansion from 63 to 668 seems like a stretch.
Here in the Netherlands, we often see that local market demand and specific platform strategies are bigger drivers.
For instance, if a platform like OpenRouter is trying to capture more users in this market, they'd actively onboard new models based on user feedback and what competitors offer, not just because someone is counting.
My local hardware store tracks new tools, but that doesn't cause manufacturers to release them; it just helps the store decide what to stock for us DIYers.