Trying to download big images using browser downloads or wget only need some small interruption to fail. Indeed with any new large file becoming available and several people trying to access it at the same time, there is also the posibility of lack of access from the source end as well so the probability of error is multiplied at precisely the time most people want it.
Torrent is designed specifically for this use case and becomes more efficient the more people accessing it. So it matches the actual task more closely.
I suspect it’s also more secure, if that is a concern.
It’s easy to see it as an added complication but it really is the ‘best’ way to do this. . .