Re: VPN and Juice
"I don't think browsers and OS's take fingerprinting seriously enough"
A simple server-side access log stores your IP address. Beyond that, browser information is nearly always sent, information that identifies your OS and browser make/model. Most people don't delete or block cookies from "trackers" like g00gle and face-barf. And there are those hidden 3rd party GIF files with alphabet-soup URLs, and corresponding server-side logs, for 'beyond cookie' tracking.
Did your browser just send a 'header request' for that tiny transparent GIF file, because it was already in the cache? TRACKED you! Didn't need a cookie for that, so your cookie blocker was meaningless. You might as well have a fixed IPv4 address. Muahahahaha!
So then 'whatever tracking service/' gets to store all that, sort it, summarize it, massage it into a product, and sell, sell, sell YOUR online behavior, simply because you visit sites they're connected to.
Knowing its possible is half the battle, and VPNs (or frequently changed IP addresses), ad/script blockers, and cookie blockers won't protect you from THAT kind of tracking.
So yeah, most DEFINITELY browsers and OSs don't take fingerprinting seriously enough.