Do you have proof that Sol-Ark played a significant role in the design of the inverter before this exclusive rights agreement took place? I think it far more likely they just negotiated distribution rights to an existing Chinese inverter design. Nothing about Sol-Arks early beginnings make it look like they had the ability to design anything. Their company image looked like a bunch of "as seen on tv" crooks until not too long ago.
Even if that were the case, and Sol-Ark designed the inverter, Deye and the rest of them have absolutley no morale right to brick an inverter remotely that a customer paid for without notice and refund of purchase price. Just because something can happen legally, doesn't mean it is right. We should strive to make our laws moral, not adjust our morals to our laws, which are often written by bribed sociopaths.