I’m assuming static content hosted on some serverless architecture (so you’re not reserving CPU cycles when nobody is actually using the site), where the host is able to optimize things pretty heavily.
I’m also assuming that the data center gets a significant amount of their energy from renewable sources. Google, for example, offsets 100% of their energy usage with renewable energy. [1]
Probably good, but again, heat reclamation vs free cooling vs AC also matters. In terms of environmental impact, where the heat goes is of enormous consequence. If Google are using AC, they're raising energy demand and therefore lengthening the road to decarbonisation. If they are using free cooling, that's sort of OK. If they're pumping heat to people's houses, that's fantastic as it displaces their heat demands.
No dispute here that economies of scale apply on the compute side.
I’m also assuming that the data center gets a significant amount of their energy from renewable sources. Google, for example, offsets 100% of their energy usage with renewable energy. [1]
[1] https://www.google.com/about/datacenters/cleanenergy/