If only there was any evidence at all. Trump could only find 50 people incorrectly registered to vote in all of California. They still check your registration at the polls too.
Kinda like how you can point to an essentially arbitrarily large quantity of illegal immigrants if you first manufacture them by revoking their ability to be here legally, without informing them.
It's not hacking, it's just surprise maintenance of someone else's computer.
It's not fraud, it's just maintenance of someone else's money into my bank account.