I hope those folks, well-intentioned as they may have been, did not deprive actual hospitals from getting the equipment that they needed by doing this.

Could you please provide the reference? The ventilation procedure is very difficult and dangerous to carry out, and I've seen people confusing oxygen mask and related devices (as treatment for mild syndromes) with ventilators.

considering the cost of ventilators I doubt that people in Wuhan were using them in any numbers likely to be noted, thus yes, oxygen masks and related devices most probably.