Implementing NICs in FPGAs (typically with PCIe attachment) is super common. Regarding USB: CDC-NCM isn't hard to implement in any MCU but implementing a USB H

Implementing NICs in FPGAs (typically with PCIe attachment) is super common. Regarding USB: CDC-NCM isn't hard to implement in any MCU but implementing a USB HS PHY basically requires ASIC hardware. If you use a $0.30 USB HS ULPI PHY, one could implement USB CDC-NCM in an FPGA pretty easily.