What's opensource got to do with cloud ?
Answer: bugger all.

The way to make a system secure is simply not to connect it to the internet. Viola 100% cyber security.

The hyrel has it's own built in computer and software - that you don't have to connect to the internet.

The only way to make a computer secure is to not connect it to the net. And that's so simple and easy I don't see what the problem is.
Most slicing and design software is standalone.

Looks like you're making a lot out of a pretty much non-existent problem.