Eh, not much nefarious you can do by pushing data around. Taking a lot of CPU/GPU usage? Certainly, you can do a lot of evil with distributed computing. But bandwidth?

Costs a lot to host all that data to push to people, and to handle streaming it to so many as well, all for them to just... throw it out? Users certainly don't keep enough storage to even store a constant 100Mb/s of sneaky evil data, let alone do any compute with it, because the game's CPU/GPU usage isn't particularly out of the ordinary.

So not much you could do here. Ockham's razor here just says... planes are fast, MSFS is a high fidelity game, they've gotta load a lot of high accuracy data very quickly and probably can't spare the CPU for terribly complicated decompression.