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I don't think those services have an API that would allow SG to do what they do with Steam.

I don't think there are enough games on any of those platforms but GOG to merit the time and effort to maintain giveaways sections for those platforms.

It's steamgifts, not uplaygifts, so no. Although I realize that many people would appreciate it, but it's a content for other website. Same like trades are for steamtrades.

I don't know how much stuff would be going on there - steam bundles make up the vast majority of the giveaways, as far as I know other platforms don't have bundles with games tradeable one-by-one

no.
people drop keys for those anyway...

I think it would be nice. Obviously it couldn't be included into the CV system and there'd be no checking of ownership etc. I recently had a Dragon Age key for origin that I had no need for, so I did a little forum giveaway using a random picker to select the winner. Obviously there was no CV reward for that anyway, so it would have been nice to use the steamgifts system to handle it. There are quite a few games that are only available on origin, so at the very least being allowed to make some giveaways for these if you wanted would be nifty.

steam
gifts

You really like your threads...

Yes. When the free games option is implemented, this can be added to that section too. So people can just give keys, no counting, no CV, no checks, nothing.