Technical Details section of help explains "we buffer batches of coin flips in advance to ensure a responsive experience. Your coin flips are always drawn directly from a quantum circuit, though no necessarily in real-time."

In reality, it's a room full of interns flipping quarters and averaging their results in "real time"

Am I wrong, or would that mean this “quantum flip” can be biased by race conditions, round robin, CDNs, things like that?

yea its not truly random. not sure how predictable the batching or caching is