It's just not important.  If they were dishonest, they could hold back hash power and solo mine, or sell hardware and not disclose the income, or 100 other dishonest things to not pay their due to the shareholders.  Worrying about locking their shares doesn't even make sense once you accept that they actually designed/produced and constructed mining rigs and are paying out dividends.  Locking shares is only important if you think they are a scam.

Asking them to lock shares is frankly a vote of no-confidence and a blatant slap in the face and I'm ready for the issue to die.