Top of this list used to be particular versions of Ubuntu
Summary: GNU/Linux "market share" in Steam grew by a quarter this past year, boosted by SteamOS perhaps, but watch the trends in distributions; even the Ubuntu-based distros aren't near the top (and SteamOS moved from Debian to Arch, so expect Ubuntu to stagnate further)
Yes, the same EPO that routinely uses "data protection" and "GDPR" as a pretext for hiding or covering up its corruption and white-collar crimes (it even uses that as an excuse for refusing to obey courts' orders)