I would honestly expect AI ads to be invisible, and for them to just be injected by the provider as part of the prompt. For example, you ask for something about firefox, but the AI tells you that firefox has a nasty ugly way to solve your problem and it would be easier to install chrome.
Ditto. AI has the power to make you believe stuff without you noticing, why would they bother with garish ads when they could make you think it was YOUR idea to buy Chlorox?
I guess maybe the garish colors could increase your suggestibility indirectly maybe?
In fact, it's pretty easy to conclude what percentage of engineers it's better than: all it does is it consumes as much data as possible and returns the statistically most probable answer, therefore it's gonna be better than roughly 50% of engineers. Maybe you can claim that it's better than 60% of engineers because bottom-of-the-barrel engineers tend to not publish their works online for it to be used as training data, but for every one of those you have a bunch of non-engineers that don't do this for a living putting their shitty attempts at getting stuff done using code online, so I'm actually gonna correct myself immediately and say that it's about 40%.
The same goes for every other output: it's gonna make the world's most average article, the most average song in a genre and so on. You can nudge it to be slightly better than the average with great effort, but no, you absolutely cannot make it better than most.
IMHO, the reasons not to use AI are social, not logical.