ChatGPT is the 5th most visited website in the world and gets a ridiculous amount of user data. They're going to be an advertising powerhouse.
Reddit has been one of the world's top websites for over a decade, yet they are totally irrelevant in terms of ad product market share.
ChatGPT ads are low quality placed at the bottom barely noticed.
ChatGPT ads will get better. Meta's social userbase is drying up. Google keeps introducing and removing things from chrome to keep access to spy on you for them alone. We'll see how things pan out but in ten more years reddit ads will still be worthless.
It will draw a non-zero number just curious people who never use ChatGPT.
And bots are exfiltrating model knowledge for the benefit of competition.