His theory was certainly expanded upon by a great deal of European thinkers later on, though he provided strong foundations.

Being prebuilt isn’t the same as open source! By that metric Linux is closed source because 99.9% of Linux users don’t build their own kernels (and those that do ought to shower anyway).

Tox also isn’t that great security wise. It’s hard to beat Signal when it comes to security messengers. And Signal is open source so, if it did anything weird with private keys, everyone would know

Marx was an economist too