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it seems everybody on HN would already know this

Well, ye, it's not news. But it'll keep happening and be reported on over and over as no politician wants to be the next JFK.

if they spy on each other then they might enter infinite recursion, until they run out of stack space.

Well, given that spying involves lots of tailing, one can hope that the recursion is optimized away.

not if they do it in python. They don't do any tail call optimization in python.