There used to be a service like this, called Car2Go. Not autonomous, but more like how scooter/bike rentals work. It was fantastic, and in no way profitable.
There are still services like that. Miles, for example, or Bolt I think have cars, too.
As an enemy to free speech, you wont be allowed in.
What's darker than dark?
On Android, why would you not use the calendar when you want to be alerted days from now?
There are also other methods, like using zmap/zgrab to probe for servers that respond to VPN software handshakes, which can in theory be run against the entire IP space. (this also highlights non-commercial VPNs which are not generally the target of our detection, so we use this sparingly)
It will never cover every VPN or proxy in existence, but it gets pretty close.