For those who claim it during this time, it will be yours to own forever. Part of a promotion by Ubisoft for Gamescom.
"Ubisoft took advantage of gamescom 2018 to distribute the Starter Edition of For Honor for free for a few days. From August 22 at 7:00 pm and August 27 at 7:00 pm, the fighting game will be distributed free of charge on Steam and the players who unlock it during the interval will be able to keep the game for life."
Edited