Why do you think they want on-line voting. They can track every voter and how they voted.
The dems have long proposed that voting be mandatory, making refusal to participate a misdemeanor punishable by fines.
As for the concept of "secret ballot", it seems naive to believe that technological advances haven't rendered it obsolete.
As we've seen with the IRS being politically weaponized against those on the right and the GOP Congress unwilling to rein them in, voting for Trump could have very real consequences as Secretaries of State share electoral results with their departments of revenue and the IRS.