Yeah, if Gleam isn't anyone's cup of tea (it literally just takes 1 link which is directly the anniversary page, and other items are optional since it already generates a code for you), other sources are listed on this post: https://steamcommunity.com/app/218620/discussions/8/3115920924801369925/
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Actually, I thought that too, but I can't find it anywhere in the guidelines...
The closest I find is this:
Third party giveaways that require or reward users for performing profitable actions. For example, linking to a giveaway on another service that requires or incentivizes users to click a referral link, like a Facebook page, follow a Twitter account, join a Steam group, complete a survey, sign-up for a newsletter, or make a donation.
But in this particular case, the only action is to click a link, which isn't a referral link but just a link to the publisher's website (ie the same company who runs the GA and provides the key as well as the base game). It's pretty much as if they ran the GA on their own page, only since they use Gleam for protection, they make us visit via a separate action. I'd be curious to know if Gleam is still against the rules in such a case 👀
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it gives you +1 to your DLC count
https://steamcommunity.com/games/218620/announcements/detail/4242946177701952295
gleam.io link - you just need to visit the site (1st task) and it will give you the key
EDIT: deleted the direct link, you can find it in the first post though, just scroll down a little
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