So like wireguard then?
Re Dropbox: https://news.ycombinator.com/item?id=9224
I stopped using Windows many, many years ago. The company behind it now runs a dubiously consensual "botnet" (C&C, RCE) called "Windows Update"
Dropbox as I understand it was a company that wanted people to store their personal files on someone else's computers
This is the antithesis of "self-hosting" which what the OP is about