Maybe it's just me, but it feels like this is trying to scare people into thinking that the VPNs mentioned are doing this tracking on the sites you visit while using their VPN, when it's really only about the VPN's own website (which people usually visit only when they sign up). It doesn't explicitly say the tracking is happening while using the VPNs in question, but I would bet a large portion of readers assume that…
If the VPN company insists on tracking me to this extent when I'm on their website, why should I trust them to not track me when I'm using their VPN? You would think a company whose core product is supposed to be about privacy would be extra careful to respect its customers' privacy on their own website.
I think you make a valid point, but there's a difference between their sales pipeline and their actual product. These VPN providers are businesses, and they're trying to optimize their sales. What demographics are most interested in their products? How did they get there? Does Google Analytics (or Facebook, or similar) have profiles on people shopping for VPNs? Are there advertising patterns that could have better ROI for attracting users?
I'm not defending the ethics of major VPN providers -- they certainly don't all have stellar records -- but I would be surprised if any major SaaS company didn't track user behavior on their brochureware/sales pages.