In Estonian e-voting they allowed to change the vote later or re-vote offline. So that if someone sold their vote or was forced to vote, they can later change t

In Estonian e-voting they allowed to change the vote later or re-vote offline. So that if someone sold their vote or was forced to vote, they can later change their mind. But such scheme is still vulnerable: for example, imagine if a large state-owned or having close ties with government company forces their employees to vote online under supervision. If the employees are not very good with computers or don't own one, they cannot change their vote online later, and employer can set their shifts to a voting day so that they cannot visit the polling station.