I unfortunately don't know the entire history here, but it really comes down to what was purchased. If Philips sold the Philips Hue hub as a generic controller

I unfortunately don't know the entire history here, but it really comes down to what was purchased. If Philips sold the Philips Hue hub as a generic controller for all Zigbee lights, then yeah, I'd agree: they essentially did a bait-and-switch after purchase, and this is totally wrong. Like class-action lawsuit wrong. If they sold it as a controller for Philips bulbs without mentioning Zigbee interoperability, then it's customer-hostile, to be sure, but not necessarily wrong, in my eyes.