Thunderbolt3 -> USB4

[…]Today, Intel announced that it contributed the Intel Thunderbolt protocol specification to the USB Promoter Group, enabling other chip makers to build Thunderbolt compatible silicon, royalty-free. In addition, the USB Promoter Group announced the pending release of the USB4 specification, based on the Thunderbolt protocol. […]

https://newsroom.intel.com/news/intel-takes-steps-enable-thunderbolt-3-everywhere-releases-protocol/

https://arstechnica.com/gadgets/2019/03/thunderbolt-3-becomes-usb4-as-intels-interconnect-goes-royalty-free/

Intel shares Thunderbolt with USB Promoter Group, and USB4 is on the way

With USB 4, Thunderbolt and USB will converge