Well, yeah, the Beacon chain is running but shards is not live nor is the docking of Ethereum mainnet and Eth 2.0, so of course people are not really interested in building on it yet, it's barely in production. Once the two chains work together, I'm sure there will be an explosion of activity.

But until then, we can't really say that Ethereum is 100% PoS, although one pre-alpha project is.