I signed up to this to see how this would work out. Years ago, before IGN bought out Humble Bundle, I used to enjoy the non-subscription model to ensure I didn't waste money getting games I already have. Plus, devs and charities get a nice slice. Since they were taken over, their offerings declined, yet the price went right up, and I feel this fills that void.
Please note that am I not comparing services. If this ends up being anything similar to Prime giveaways on Twitch (again not trying to compare), it's well worth the Premium.
I should note that the only platform I don't use is Epic, so if that is offered to us I'd prefer to redeem on Steam, GOG, EA, Ubisoft, Rockstar, plus all the other indie sites etc. Also, if you can also include OSTs, I'd be up for that because there are some amazing soundtracks, I collected a lot from Humble, and I always try to get them on sale.
One last query: what happens if I don't redeem any of the monthly offers because I either already own them and friends do too?
It will likely depend on what all is being offered. Game keys could be gifted to others, possibly traded here on the site with others or you could always donate them to our yearly Day of Giving.