The DLC Skin pack requires the base game to use, Destiny 2 is Free to play: (Alternatively you can just add the base game and it auto adds the DLC Skinpack)...
Also Shop Titans which looks to be a mobile port microtransaction hell game, I'm not going to post a trailer or anything on it as I don't support that kind of garbage.
Link works correctly for me as of this moment, sometimes I do have issues with EGS links and my VPN filtering it also sometimes EGS will modify store pages for freebies causing a broken link for a little bit which we've seen a couple of times.
You didn't read the GoG newsletter obviously :p
It's also always been hidden in plain site at the bottom of the page(s) on GoG, I found out about it last year from a newsletter and then just started noticing the link everywhere.
Note: This is a repeat so you may already have it, the DLC however you may not have (and I believe is always free but you know the rule)
Match Day - https://www.epicgames.com/store/en-US/p/cities-skylines--match-day
I would guess it will be the "Tomb Raider: Definitive Survivor Trilogy" that's around on the Xbox store and PStore
Tomb Raider definitive edition, Rise of The Tomb Raider, and Shadow of The Tomb Raider + Season Passes for Rise/Shadow, Skins, and Challenge Packs (and the Baba Yaga DLC for Rise...
This occurred with GTA:V as well the entire EGS went down today as well so either it's a combined load or there's some other stuff putting load on their system.
Either way try again later and it should work, I had to wait like 5-6 hours with GTA:V before it went through
It's an extended demo that can be extensively be tested.
As was last time Prison Architect was offered up (though a different version) the "Cleared For Transport" DLC is also currently free:
*Note "Antstream Arcade" What you are getting there is "1090 Gems" "This in-game currency can be spent on playing games, challenges and limited-time tournaments! Gems can also be used to unlock harder challenges and play turn-based PvP against friends and other players"
While I haven't played...