Valve Seemingly Bans All Steam Games That Require Watching Advertisements To Play
Briefly

Valve has reaffirmed that games requiring users to watch paid ads are banned from Steam, clarifying existing rules on a new page. Developers cannot use advertising as a business model or offer in-game rewards for ad engagement. Although some sources claim this policy is not new, recent changes to the storefront have also introduced warnings for Early Access games that haven't been updated in over a year, ensuring transparency for players regarding ongoing developments in those titles.
Developers should not utilize paid advertising as a business model in their game, such as requiring players to watch or otherwise engage with advertising in order to play.
If your game's business model relies on advertising on other platforms, you will need to remove those elements before shipping on Steam.
Read at GameSpot
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