Do they? Now it’s just Lightning and USB-C and it looks like Apple is finally conceding. But I agree there was a time before smart phones where it was truly all over the place.
Apple was ahead of the game though, in that their iPhone/iPod/iPad chargers had a USB-A socket (except for some of the very early iPod chargers which had Firewire 400 sockets), while other phone manufacturers were still using chargers with non-removable cables.
I still use my Apple chargers from the early 2000s, while all the chargers I had for other phones and devices are just e-waste.