with the amount of information they collect on their customers, it better be damn good. honestly, the only reason it's not a huge privacy problem is because they zealously guard that data to protect their near monopoly on PC gaming.
Gabe has been pandering to gamers and mostly giving us what we want, but when he dies, we better hope the next dude in charge isn't some corporate suit that only cares about maximizing profits in every way that they can, or the enshitification of Steam is going to really fucking hurt. imagine if Valve was run like Microsoft. for example, the next guy might cut a deal with Microsoft to stop supporting Proton.

it sounds great, sure. but it's entirely pointless. at best you're wasting fractions of a penny of the advertisers money. you're not "poisoning" your data. if you click on every ad they show you, it becomes obvious what you're attempting and they just start showing you generic ads based on your gender and demographic.
many of these advertisers brag about having thousands of data points on every person. they won't be fooled by tricks like these.