Grenade spam Legit or bug/exploit?

So i just came out of a warzone assault match and the defending team in every objective used grenade spam in the bases they had like 4 to 5 gungooses. What i am wondering is this. Is this a legit strategy? Because its bloody annoying its just infinite grenades.

nades for days

nade spam the best thing to keep people away. just wish random nades didn’t find their way to my face.

Gungoose passengers have infinite grenades. It’s no glitch.

Yeah, another thing 343 thought was a good idea. No glitch btw.

Seriously thats legit? My god. Its annoying when its a premade company doing this coordinated. Whoever thought this was a good idea give them a medal its just daft.