[mohn]

Your source says its numbers are "generated with the unix command line tool ping", which reports round trip time.

In fiber, with light traveling at about (2/3) * c, the minimum latency from SF to Tokyo would be about 42 ms.

[strix_varius]

Those are point-to-point pings between data centers.

The physical fiber optic floor from SF to Tokyo is about 50ms, point-to-point, with no sub-fiber last miles, wifi access points, or delay from routers and switches.

Actual user-to-user latency is much higher than that. Agora, for example, cites:

> Low latency, 400ms average globally