Cross-platform support for their hardware is not something the typical user will take advantage of. If the user has an iPhone they can buy the Lightning versio

Cross-platform support for their hardware is not something the typical user will take advantage of. If the user has an iPhone they can buy the Lightning version, and if they use an Android phone, they can buy the micro USB version. But chances are the user won't be switching the card reader from one device to another all the time.