There is no reason I can fathom to be against it. GTA V is more than capable of running fine on Switch as it was originally a 7th Gen game. The online will be crap, but the single-player is there.
GTA V could've been on Wii U, but Rockstar never put any games on the Wii U.
Lifetime Sales Predictions
Switch: 144 million (was 73, then 96, then 113 million, then 125 million)
PS5: 105 million Xbox Series S/X: 60 million
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima