^^^Actually, Toy GR did not have to build a set/certain number of Yaris GR street cars in order to compete in the WRC.
The WRC has been on a 'kit car' type formula for their top spec cars ever since the end of the Group A class era (in 1996), which DID require the building of 5000, (and then 2500 later) 'base' versions of their AWD competition cars.
The current 'kit' formula uses the absolute most base, FWD, econoboxes from each manufacturer, and then applies a whole set rules meeting 'kit' to convert them into the AWD/turbo/sequential gearbox/carbon aero wonder monsters they now are.
It is almost as if Toy 'reverse engineered', 'de-aeroed', and de-tuned their Yaris GR street car from their WRC GR for the sake of enthusiasts (and 'bragging rights', I guess?), since they did NOT have to build it that way in order to compete (it actually was released AFTER they were already competing with the Yaris WRC in events).
But, a carbon fiber roof is VERBOTEN by the FIA in the WRC, so they gave the street cars a little 'something extra'. LOL
Next year the WRC Rally 1 class goes to a hybrid formula, so even LESS chance of any manufacturers building a SMALL hot hatch with a co$tly powerful hybrid AWD drivetrain just to 'appear like' their ultimate WRC weapons.