This whole move is about corporate governance. The US makes it really easy to start or manage corporations and the courts are (mostly) streamlined and predictable, especially the chancery courts in Delaware. Cayman Islands adopted much of Delaware's legal approach to corporations in 2016 to make the island more business friendly rather than just a tax haven, and they've got a foot in the Latin American market. Singap…
While I think this was obviously more complicated than a single entity and probably required two sets of specialists rather than just one, it certainly worked and I would expect something similar is possible with Canada?
The founders were not required to move to the US, but ended up doing so anyway.