Consider post processing steps if you really need smooth parts. Sandable fillers, special paints, epoxy coatings, or just a bunch of sanding. I've had good luck with XTC-3D. It's an epoxy you paint on that's specifically designed for smoothing prints.
You could also consider a resin printer if you need smooth. They are their own can of worms, but the resolution and smoothness is good.
Because mainstream porn sites are blocked or require age verification in my state. Other good reasons are to avoid some issues when torrenting things or to "be" in another country to get around Netflix and other streaming service region blocks.
Privacy and avoiding man in the middle is kinda bullshit. Nearly all websites use TLS, so mitm isn't possible. And it's only privacy from your ISP.