100% wrong, now one server compromised, which they actually control, can change millions of votes, and actually has been occurring for ages. This flips security, have you had you phone NFC hacked? Anyone? You need the same hacking brute force to attack a server or phone and must crypto mine the private key, and even if you did, it would only affect one vote.
One server, millions of votes, one private key
Hundreds of millions of devices, millions of votes, hundreds of millions of private keys.
I do not guess.