I can see applications in multiplayer gamedev - imagine being able to run the whole game simulation on a clients machine and have them assert back to you that they killed 7 goblins, looted a rare sword from a chest, and died 3 times - and you could just trust them.
Your server costs would only need to be for the metaprogression/persistence related stuff that could be done relatively infrequently based on updates from the client.
Your server costs would only need to be for the metaprogression/persistence related stuff that could be done relatively infrequently based on updates from the client.