They had to get special permission from the US government to export TPU's abroad to use in their datacenters. The TPU's fell under ITAR regulations (like many machine learning chips). The US government granted permission, but put some restriction like 'they must always be supervised by an american citizen', which I imagine leads to some very well paid foreign security guard positions for someone with the correct passport...
Read all that on some random government document portal, but can't seem to find it now...
Read all that on some random government document portal, but can't seem to find it now...