Closed ecosystems make money very directly by locking in the customer. The vendors will invest heavily in it and it will pay off, hence the "proprietary augmentation of Bluetooth sure makes me forget that the watch is using it". They will not share the tech, by working on an open standards or open tech, because that way the competition profits as well. This is just greed, anti-competitive market abuse, it's not more complicated than that.
Closed ecosystems make money very directly by locking in the customer. The vendors will invest heavily in it and it will pay off, hence the "proprietary augmentation of Bluetooth sure makes me forget that the watch is using it". They will not share the tech, by working on an open standards or open tech, because that way the competition profits as well. This is just greed, anti-competitive market abuse, it's not more complicated than that.