The reason why cell phones suddenly all started using micro usb was because the EU made them. Was it the best connector? Probably not but up until then literally every model phone used a different connector.
Sure, time-travelling legislation. Or at least that's what EU propagandists want you to believe.
In actual, you know, real reality: One: when EU passed the micro-USB legislation pretty much everyone was making micro-USB phones already (yes, you could still buy some old stock with proprietary chargers, but that was just shops selling off old stock, noone was making them anymore already)
Two: that legislation was non-binding. It was "pretty please make your cellphones have micro-USB port".
Most importantly, three: there was technical reason to switch to USB, and that was the start of smartphone era, suddenly the phone needed to be able to talk to your computer, tethering, file sharing, whatnot, and designing proprietary connector capable of all of that AND getting computer manufacturers to support it was beyond anyone except Apple. Takes "a bit" more investment than "connector will have this shape, this pin is +5V, this one is ground". And EU had nothing to do with that.
But I guess EU legislation succeeded in the most important thing: getting brainwashed morons like you to believe "we only got micro-USB on phones due to our benevolent EU overlords".