Generally, people will widebody a street car for the aesthetic. They are imitating the production race cars that use wider tires to increase traction; wide enough tires don't fit under the stock bodywork, so the fenders come out further to cover the wider tires for aerodynamic purposes.
The Lamborghini Huracan GT3(production car pulled off the line to be made into a race car) is about 80 inches wide, compared to ~76" for the stock Huracan. For comparison, a Prius comes in at a nice ~69" and the F150 is currently ~80".
Still doesn't make any aesthetic sense to make a lambo wider and I assume it already has plenty of traction so the custom tires aren't needed, but at least I know now why they do it to cars that ARENT already wider than the Strait of Gibraltar with enough downforce to make gravity itself blush 😂