The Windows Store was introduced in 2012, 14 years ago, and promptly went nowhere; Gabe Newell is ex-Microsoft himself and undoubtedly had a good understanding of how dim the prospects and how poor the execution was for it. Yet he persisted in pursuing the Steam Machine and Proton long after it was clear that the Windows Store was a flop.
If you want philanthropy (or perhaps not), Gabe Newell has $1 billion worth of yachts and research ships.