Disclaimer, Just speculation here. wondering if these inverters were designed by solark, then sourced to China for MFG where china’s IP laws are grey... Poof, the plans are stolen and used for sale to other companies. Probably another reason to be careful who you deal with when outsourcing mfg to China. They’d probably get in trouble for exporting to US, because then they would be violating trade-law? Again, pure speculation.
Edit: Or perhaps solark even allows Deye to produce and sell their design in markets that solark is not in or does not intend to enter....