Well, there's no loot boxes, so people aren't getting infinite loot boxes.People were using cheat engine to buy unlimited (silver) loot boxes.
Middle-earth: Shadow of War PC Cheat Gives Infinite Loot Boxes
But the save files are all stored locally, so you can edit and cheat whatever you want. Including adding hacked orcs to your fort defenses that are more than perfectly rolled.
I asked a similar question of the SoW community, basically asking whether the top forts were all full of hacked orcs.
The response was that because in online conquests, defenders are chosen from a pool of players who are active in online conquests themselves, so a cheater would have to create a bunch of hacked orcs, and then continue to play. I'm sure there are some people who do this, but the game would get boring real fast once you started to bypass the central point of the game (developing your orc army). So people say it's rare to see hacked orc forts in online conquests.
I can't confirm myself, I'm still working my way through shadow wars and trying to level up high enough to dominate the orcs I'd fight in online conquests.