In ESXi 7.x, the vusb0 adapter is created automatically by the vendor-provided custom ISO used to install or upgrade ESXi.
VMware vSphere ESXi 7.0
In ESXi 7.0, disable the USB interface in the remote management application that you use by following the appropriate hardware (Dell for iDRAC, HPE for iLO, etc.) vendor documentation.
For ESXi 8.0, please see: ESXi creates standard switch vSwitchBMC with uplink vusb0 automatically after upgrading to 8.0.3 version