If your grandparents were business owners most of their customers were met face to face. Customers may have gone to church with your grandparents or attended high school sports events and concerts. They knew each other and that made marketing much less taxing and far more trusting.
At the end of the day, the only way that an Internet based business is going to thrive or even survive, is through ever increasing targeted traffic to their products.
Most of the time when we see this, it’s unintentional or at least not malicious in origin: forums that generate both regular and stripped-down mobile-targeted pages, store items shown (and — worse yet — linked) via multiple distinct URLs, and so on.