Accidentally? Because a lot of ads are designed to trick you into clicking on them.
I have a pihole that blocks most of them from loading, but sometimes I accidentally click on one.
The last time I intentionally clicked on an ad, when I was fired from my job and I kept seeing google ads because we used gmail for everything back then, and I knew it drove the CEO crazy that he was paying per clickthrough. So I would click on it and bounce around the website all the way to the cart, and then abandon the cart with thousands of dollars of stuff in it.
I'm pretty sure he could see my google account associated with the activity.