Qutest’s USB input is galvanically isolated.
Non-USB 2.0 spec cables can have issues in general but sometimes more with isolated DAC USB inputs.
The Schiit Modi’s USB input isn’t galvanically isolated.
If you add an ISO Regen you may run into issues with your Curious, with your Mac.
Stick to USB spec cables like this (ask Rob Watts, not John Darko what he thinks of this cable vs Curious):
https://www.amazon.com/Tripp-Lite-Hi-Speed-Ferrite-U023-006/dp/B003MQ29B2/r