I hope it doesn't need saying but:
Do NOT use USB splitters if one of the devices supports quickcharge or USB-PD.
If you use a splitter to e.g charge a phone while also connecting a DAC or speaker or whatever, the phone might negotiate 9, 12 or even 20V from the USB port the splitter is plugged into, which will cause everything else on that same splitter that only supports 5v to get fried.
I've seen some reports of people accidentally running into this.. So please be careful with splitters.