For me i dont see a big spike in my data usage before and after MSFS 24 release
Also, a good thing is use a biggest Roling Cache, because the Core Sim is installed on your PC, but Aircraft and Screnery is streaming/download in demand, if you have a big rolling cache (100-200GB) can help you alot 
Also in a next update, you have get possibility download some part of sim localy