I've never had any issues running dumb USB loads off any of my MacBooks. Just tested it, no problem running 1.7 A of dumb resistors just soldered to the power pins with nothing on the data pins at all (not even the passive "apple charging" resistors) https://kalleboo.com/linked/usb-dummy-load.jpg

Macs will shut down a port if it goes over 2.4 A (IIRC) without USB-PD negotiation (mainly with the cable rather than the device).

But the USB standard says they should limit to 100 mA without USB 1.x negotiation, and it's not doing that.