Vista should be safe from Win10 spying ports. No point in trying to do that to an OS that's soon to be unsupported.
But... we have to remember, out of Vista/7/8.1, Vista is probably the most 1984-like OS of the three. It was created during a time when MSFT saw what Google did to their revenue models by profiling every user and tracking them! As a consequence, when Vista hit the market, we saw laptops go mainstream with fingerprint sensors and webcams for the first time. Also have to remember Vista is the OS that wouldn't let you shut down the computer (at least not on default settings), only put into hibernation! Why? They want to be able to turn it back on when you're sleeping, so all the info they've gathered about you could be sent back to them.
Of course, when they saw that Vista didn't gain any traction, they sort of downsized their ad-targetting department/team and concentrated on making a sequel OS that could out-compete Macs instead. And that is why 7/8.1 are slimmer in the Big Brother department. But now they've gone full circle again. Both Apple + Google are now major threats whereas before, it was only Macs.
Now, some really scary stuff... They're now able to track you based on your typing habits the same way everyone has different fingerprints. Betcha this will be one of the features MSFT would be dying to see exist in Win7/8.1 via those hotfixes...