Just ask someone from the industry itself. Like me. I didn't met a single "online marketeer" that ever offered such an option to (re-)target customers. Doesn't

Just ask someone from the industry itself. Like me. I didn't met a single "online marketeer" that ever offered such an option to (re-)target customers. Doesn't mean there are fishy tools to allow that. But I am pretty sure, that no bigger advertiser or publisher is currently making use of such kind of technology. Besides the "it's illegal" argument there's also this: "it's unethical". It would fall back on the advertiser itself. Besides that, I guess it's a known fact, that "digital assistants" like Alexa are actually listening to every word you speak and therefore indeed offer products based on what you said.