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Since forever, which protocol do you think it's not? For a few examples here's PCI and DDR5
USB is a standardized connector, with again an open source protocol. Here's the specification in case you're interested https://www.usb.org/document-library/usb-20-specification
I would need a source for that, I've had AMD +Nvidia up until very recently and it worked as expected.
USB is absolutely not a standardized connector, otherwise it would only be one type of connector, not the dozen or so they've made over the decades. There's nothing universal about it.
And if it was open source, then why doesn't VirtualBox release the source code for their USB extension package?
USB is absolutely standardized, I even sent you the 2.0 spec, you can get the spec for the other versions on the same website.
Different versions/connectors have different specs, all of them open, otherwise different manufacturers wouldn't be able to create devices that use it.
That's ridiculous, first of all the name relates to the fact that it can be used for any data transfer as long as it's serial. Secondly the sheer amount of different devices from different manufacturers that can be plugged via USB should give you a hint of just how universal and open the standard is.
The standard is open, implementations of it are not, it's like OpenGL or Vulkan.
USB 1.0, 1.1, 2.0, 3.0, 3.1, A, B, C connectors, large and small.
Not even counting the various charging rates and voltages..
So? What's your point? All of those are open specifications.
Next you'll tell me that Linux is not open source because Debian, Fedora, Arch, Gentoo, Slackware, X32, X64 architectures, server and home versions. Not even counting the various distros derived from any of them nor the different kernel versions.