I'd argue there's probably more overlap than we'd think with gamers and buying figures. Gamers tend to be more loyal to a property than a brand, if that makes sense- a Halo lover will buy all/most things Halo, a God of War lover will buy all/most things God of War, etc. I have a few friends who would consider themselves gamers over anything else, while being more passive collectors. Some even continue to buy physical media, making semi-regular stops into GameStop. If they see a collectible that catches their eye, they'll probably buy it, but they don't actively seek them out.
But not a single one of them knew about these figures. One said they remember hearing something about it a while back, but had forgotten all about it because they never saw them advertised anywhere. He said he remembers seeing a Varl figure once, but figured it was either a one-off, or from a dedicated Horizon line, not an overall Playstation line.
So I'd argue that advertising certainly was a fault. Distribution too, to an extent. Personally, I saw the odd Kratos and Atreus, but that was about it. Don't know if I ever saw Jin or Aloy in stores. Joel and Ellie maybe once or twice until the other day. GameStop is obviously a no-brainer store, but these really needed to be in at least one of the big box stores- WalMart, Target, Best Buy, etc, especially as more and more of those stores have dedicated "collector" sections next to/near the video games. My local Target has a little section toward the front of the video games that have video game focused collectibles- currently a lot of Fallout, some Mario, etc. I think if these had been there, they'd have sold pretty well. I think this is a line that you could arguably sustain on just passive pick-ups. If a God of War fan sees a Kratos that looks cool, they'll probably pick him up. Same with a Nathan Drake, or Sam Fisher, Jak and Daxter, etc.
Say what you want about Funko Pops- they deserve a lot of the criticism- but if there's one thing they've taught us, it's that folks do have love and nostalgia for some of these older properties, and are willing to pick up even a one-off collectible here and there if they're priced well and- perhaps most importantly- they're put in a place where most folks can find them.