Tried on a couple of machines (intel and m1) all running Big Sur. They all run 6.2.30 fine but once you install 6.3.15 via .pkg it doesn’t seem like fdbserver would run at all.
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Just for posterity, doing:
sudo xattr -r -d com.apple.quarantine /usr/local/libexec/fdbserver
sudo pkill fdbserver
fixes the issue.