Can a DAO Vote to Alter a Pre-Programmed Vesting Schedule?
It depends on the initial design of the vesting smart contract. If the contract was coded with an 'owner' or 'governance' function that allows for modification, a DAO vote could potentially alter the schedule.
However, if the contract is truly immutable and decentralized, no entity, including the DAO, can change the pre-programmed release terms. Investors prefer immutable contracts.