I use FreeCAD

Fortunately we have a Foss alternative for almost everything

Yes. In order to launder your dirty traffic, you need to mix it with lots of other traffic. And you need it to be safe to avoid attribution.

The US military (and various 3-letter agencies) needs the service to be secure, provide strong anonymity, and to include a sea of traffic thats mostly not their own

Not at all, if you understand why they created it and how they use it