they are not brute forcing
random addresses/private keys. they are
solving a puzzle to find private keys that were intentionally placed in an extremely smaller space compared to actual private key range to be found easily.
Oh! I thought they were in a fruitless pursuit for ill-gotten coins so I didn't delve into it when it started and never got the full story. All this time I thought they were a bunch of thieving bastards who would never be successful.
I might have been wrong on one of those counts
