I dont know if it sooths your reservations at all the fact that all premined coins have been placed in escrow wallets, locked until 2020. You may check and confirm it at the announcement post.
The value of Sumo will have increased manyfold by 2020 also. Therefore, having the premined coins locked in escrow is not a valid nor a logical proof or indication of "sincerity". Furthermore, who has control of the escrow in the first place?