I’m in a group chat for a language I am studying. It gets targeted for event flyers due to the group’s subject. These sorts of flyers are allowed where other advertising is not because they add value to the group, even though most of them are for-profit.
Ads provide information. An event you might be interested in is happening. A food you might like is available. A thing that will totally improve your life can be yours. etc
The information in most ads is things like: "Skinny beautiful people are worthy of love and use this brand of makeup". Or "good parents who love their children go to Disney World". Or "it's a rugged and cool type of person that buys a Jeep".
The type of ads that do what you're taking about are sought out. People willingly watch Nintendo Directs.
If that is all they were they wouldn't be a problem but this is obviously an over simplification.