I have a few keys from a bundle: DIG GreenLight Bundle 3
(ALL ITCH . IO GAMES TAKEN)Color Chemistry
Caravanserail
Porradaria 2
Star Fields
Catch A Falling Star
Color Chaos
Kivi, Toilet and Shotgun
Cabby Gils
They're itch . io links but you'll get steam keys when/if they are released on steam after greenlight.
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I also have some steam keys:
Lunar Pack: Lunnye Devitsy and Wake
Pixel Puzzles: Japan(x2)
particula
Steel & Steam: Episode 1(x3)
sumo revise
Desert Thunder(x3)
super distro(x2)
(steam keys were picked up from U.K region)
At the least u can get trading cards from some of them even if the games might not be great.
I have no clue how trading cards work as i've only just started paying attention to them.
I think in the main it's a big waste of time but each to their own as the saying goes