You seem to be ignoring that Overwatch has been effectively region locked for all major tournaments to date.
Teams have quite literally been forced to choose which region they represent.
Where teams reside has actually been more important than the median value of the players' nationalities.
We saw NA and EU qualifiers for the Atlantic Showdown and Overwatch Open. A few teams even switched regions between the two tournaments.
The new Rogue roster were not invited to MLG Vegas despite being an organisation based in Vegas because their players were not residing in NA (something that didn't seem to matter for half of FaZe and Fnatic?!)
EU teams were were not invited to to play in NGE's Winter Premiere, but in the eyes of tournament organisers LG (which you would deem an EU team) were eligible.
If you live in NA and are deemed to be an NA team by tournament organisers/Blizzard then are you not a NA team?