but you forgot that drugs do not have "mining", every altcoin and bitcoin that rely on pow can be disrupted easyly by a terrorist attack
this is the Achilles heel of this world, without minign you have effectively destroyed every alt, well altcoin are harder to destroy because they have gpu all over the world, not 2-3 big farm in china but still possible to cut a big hash there too
you think that there are only 2-3 big farms? and only in china......
(facepalm)
bitfury for instance have SEVERAL physical locations for the asics, that connect via several stratums to a pool.
bitmain for instance have several physical locations for the asics, that connect via several stratums to a pool.
slush for instance have several physical locations for the asics, that connect via several stratums to a pool.
and so on
in short there are ALOT more than 20 physical locations even if stats only show 20 'pools'
those pools can be run from any location and API the header data to the MANY physical farms in seconds.
take slushpool. people think its being run in china.. but actually its run from thailand.
bitfury can be run from georgia, iceland, san Fran, etc
pools have already mitigated all the current risks. and if a new law was to be created to outlaw mining. then the asic farms in an area that is proposing to outlaw mining, can hire a truck. load up their asics and move them to another location within 48 hours. far faster than it takes government to propose, discuss and vote on a new law.
again remember there are MANY asic farms per pool. so the impact of moving these individual farms vs the overall hashrate is not much.
hitting/raiding or moving a farm WONT stop cause bitcoin to stall for 48 hours. pools will still make blocks in the average timescales we expect(~10mins(2min<->1hr)).