What corporations don't have is any obligation to cede to the public demand or be held accountable for their actions. There's no democratic control, no way they can be fired by the voter nor do they have any responsibility of transparency.
Voting systems, red light cameras, municipal water, nearly every aspect is controlled by private corporations shirking responsibility oftentimes for decades. Polluting a town's water supply and walking away pretending they didn't - there's even many well known movies about things like this with academy awards. Often the criminals get away with it having hid under the legal fiction of the corporation.
If a secretive unaccountable private corporation determining the outcome of an election and claiming the audit trail is a trade secret doesn't ruffle your libertarian feathers then there's something seriously wrong.
What you claimed is yet another silly thing I've been hearing my whole life. It's totally wrong. Any inspection would immediately reveal this