Easy to setup in the sense of “how-to” in the IT world... but part of the ballot process is that its supposed to be anonymous. Once you start down this road of tracking who voted its very very easy for it to become who voted for which candidate. Once that list is made, reprisals are in the offing. Especially when one side, the left, is so interested in taking revenge for any slight, significant or not, regardless of how old the slight is (for instance, slavery - who really cares that your ancestors 140 years ago had slaves? They are dead, the slaves are dead, nothing to do about any of it).
No, this is all public information. Last election I worked as a volunteer for the Republican party in 2016 and part of my job was to track who had and who had not voted in my precinct. I then sent the information in throughout the day. I believe the precinct put out updated lists every 4 hours or so.
The difference is that currently it is NOT easily searchable. Most jurisdictions have a list of thousands of pages of names. The list only shows your name, address and if you voted (and which means you used to vote). It does not show the candidate you voted for.