I'll tell you What's New!

https://store.steampowered.com/events/ajaxgetbesteventsforuser?l=english&include_steam_blog=true
"CAN SPAM" - “Native Advertising”, problematic, harassment, ignoring users market preferences, commercial product soliciting, begging, auctioning, raffling, selling, advertising, referrals in our Steam Library area.

We all know the rules here right?

https://support.steampowered.com/kb_article.php?ref=4045-USHJ-3810
General Rules
Do not do any of the following:
Post spam - https://www.consumer.ftc.gov/articles/0038-spam
Content Rules
Do not post any content on Steam containing the following:
Soliciting, begging, auctioning, raffling, selling, advertising, referrals

Go head and further familiarize yourself as to what CAN SPAM, NATIVE ADVERTISING and ignoring the Steam users marketing preferences is all about. $$$$$$$$$$$ Links below and to the side --->

CAN SPAM covers all commercial messages, which the law defines as “any electronic mail message the primary purpose of which is the commercial advertisement or promotion of a commercial product or service,” including email that promotes content on commercial websites.

some federal courts have ruled that CAN-SPAM’s definition of “electronic mail message” includes commercial messages transmitted to a social network user’s inbox, news feed, wall, etc. - candid-answers-can-spam-questions

I guess Valve does not consider Steam a social network or our library's What's New, a featured area inbox, news feed, wall, etc. Of course they wouldn't. Control the Narrative and You Control the People!

Native Advertising - Marketers and publishers are using innovative methods to create, format, and deliver digital advertising. One form is “native advertising,” content that bears a similarity to the news, feature articles, product reviews, entertainment, and other material that surrounds it online. But as native advertising evolves, are consumers able to differentiate advertising from other content?

And or do users care that a company in it its walled garden has taken away and even ignored many of their users store marketing preferences to deliver such aggressive SPAM Native Advertising into a dedicated featured area just for that SPAM in their library?
https://v1.steam.hlxgame.cc/sharedfiles/filedetails/?id=1936585807
https://i.imgur.com/Gb11D7a.png
https://v1.steam.hlxgame.cc/sharedfiles/filedetails/?id=1907151844

Where to complain?
1.> Report buttons on ALL CAN SPAM / Native Advertising found in your library's What's New area that you do not FOLLOW or have expressly IGNORED, or other marketing preferences that were ignored.
2.> Steam Support https://help.steampowered.com/en/
3.> https://v1.steam.hlxgame.cc/groups/SteamClientBeta/discussions/
4.> FTC https://www.ftccomplaintassistant.gov/#crnt
5> Reviews
6.> Here in this dark corner of a group. But your complaints will go further expressed in the other places listed.

CAN SPAM[www.ftc.gov]
Native Advertising[www.ftc.gov]
Candid answers to CAN-SPAM questions[www.ftc.gov]