Fair question. Not too forthcoming, are they? I had originally assumed that the kerfuffle regarding workplace sexual abuse by one of the principals had something to do with it but, looking back at the release, I don't know if that's the case any more.
I lifted a quote from Burned_79 on the Stockhouse board which pretty much sums up my feelings towards ZENN and EEStor:
"All I know is that I own Zenn shares and I won't sell until EEstor declares it doesn't work."