Literally 5 seconds in Google to find how to disable. No need to dig into Group Policy or the Registry.
Settings > Personalization > Start and turn off the toggle for “Show recommendations for tips, app promotions, and more.”
Same setting that controls a lot of the anti consumer shit I've been seeing articles about lately, like it trying to force you onto a Microsoft Account when you have a local one. Do yourself a favor and just skim through the Settings menus and disable any settings related to reccomendations. They mean ads.
It's bullshit that Microsoft keeps pulling this shit, but the setting is straightforward as hell. Plus, I've never had this setting reset itself due to updates (yet).