Cookies don’t even matter for advertising anymore. They don’t need them. You leave breadcrumbs everywhere. Literally where you are, your wifi connection, browser used, browser build, device used, screen size, Google account logged into a browser, just to name a few. They string all this stuff together over days, weeks, years… you’ll slip up at some point no matter how diligent you are with something big, like that Google account login, a share from social media… there’s so much more lol