How many are hosted on AWS, Google or Microsoft? How many are using Windows or macOS? How many use nvidia, etc.
Why am I imagining this? I feel like computing systems as they've evolved, they've built stuff on layers upon layers and just like biological evolution, it is impossible (difficult) to undo because the marginal cost is too high to unwind and break backwards compatibility. We get stuck in local maxima at each layer and the critical energy required to escape out of it would be too large.
I am not saying backwards compatibility is bad, far from that, I am saying that if we force ourselves to cut the cord and completely build computing systems from scratch - I feel like we would have a hindsight to design it better, faster, and cheaper.