There are many Target vendor in Mbed site. But Platform vendor made platform boards with NXP chip only. Why? Answered

Hello, I'm Leo who is Korean and interest in Mbed platform.

Anyway I am on checking Mbed platform in Mbed site. (http://developer.mbed.org/platforms/) During check, I found that there are many Platform vendor and Target vendor.

But Platform vendor (which dose not have own MCU) made platform boards with NXP chip only. I am wondering about why they make Mbed plaform with NXP chip only althought there are many other MCU vendor (target vendor).

Is there any master who know about this?

Thank you.