Sanatorium giveaway https://www.gog.com/en/game/sanitarium
Free Witcher Enhanced Edition if you download GOG Galaxy https://www.gog.com/the_witcher_hub
Also free: https://store.steampowered.com/app/1812290/The_Elder_Scrolls_Arena/
Iris and the Giant giveaway https://www.gog.com/en/game/iris_and_the_giant_deckbuilding_roguelike
X-Morph: Defense Complete Edition giveaway https://www.gog.com/game/xmorph_defense_complete_edition
It is said elsewhere that there is no ban but access attempts to Steam are being redirected because of a DNS Cache Poisoning attack. Something...
Free Shadow Tactics: Blades of the Shogun
Ubisoft will be giving away Anno 1404 History Edition later this day....
Die Young giveaway https://freebies.indiegala.com/die-young
Free copy of Outcast 1.1 https://www.gog.com/game/outcast
Wanderlust: Transsiberian giveaway. https://www.gog.com/game/wanderlust_transsiberian
According to other articles the feature has already been disabled ages ago on Haswell and Broadwell since it never worked properly there.
Free game ARMA: Cold War Assault https://www.gog.com/game/arma_cold_war_assault
Absolute Drift giveaway https://www.gog.com/game/absolute_drift
Hellpoint giveaway https://www.gog.com/game/hellpoint
Free game Loria https://www.gog.com/game/loria
Warhammer Skulls Goodie pack and Warhammer: Shadow of the Horned Rat free on GoG https://www.gog.com/game/warhammer_skulls_digital_goodie_pack
Free Company of Heroes 2 + Ardennes Assault https://store.steampowered.com/sale/CompanyOfHeroesSale
I can't tell you exactly how it's handled by Windows but this capability has been part of the PCI specs since, well, videocards still used PCI...
Apart from being able to connect more displays the biggest benefit would probably be having access to Intel's Quicksync for video encoding....