To publish such a vague statement is an obvious invitation for speculation. It seems like rather questionable behaviour itself from spatkfun.
The fact that they mention a "private matter" makes me think this is some petty personal grievance that has somehow escalated to this.
What would you have them publish instead? Your curiosity does not overcome the right to privacy of those involved.
Yes. They really should have just put a notice up that they're no longer distributing AdaFruit products and direct people to Adafruit website.
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While SparkFun may feel entitled to air their grievances as an "Official response", these types of public statements aren't productive for business nor useful/respectful to consumers.
Public notices for the consumer should serve the consumer. I.e. they should only relate to matters that directly concern them, such as notice of availability, warranty, support or the fulfilment of other consumers' rights. Those statements should be unambiguous and not allude to blame or personal tiffs.
While Sparkfun's statement touches on availability it merely does so as a vehicle for grandstanding and retaliation through gossip and drama. The fact that SparkFun notes it's a "private matter" yet chose to involve the public also makes SparkFun look unprofessional, even if they are 0% at fault for the circumstances.
Consumers put their trust in a company, it is disrespectful of that trust when trying to embroil them in personal affairs, they never agreed to that.