the difference in nostr is the ability to not see ads is just switch to another client, so the ad ridden client needs to have a really powerful set of features that no one else has to be able to get away with it, in other words, social media ads are dead, what you'll actually see more is "influencers" shilling shit, because they have the audience. so IMO, the model will switch to full on endorsement ads, and those will popup on your feed because you follow those accounts.