[camgunz]

These problems are all theoretical. If you actually tried to implement them at the scale you'd typically need to sway a federal election you'd find it pretty unworkable. And in close elections, the recount process is pretty intense, so it's even less likely that you'll be successful.

You'll probably want more detail. Ballot harvesting can't work because data analysis shows weird patterns like this ("huh this nursing home went 95% Biden whereas every other nursing home in the county went 55%"). Recounts do signature validation and lawyers from either party can challenge any ballot they want. Voters are contacted to cure their ballots. I've worked on the Democratic side and been heavily involved in doing all of this. We had armies of lawyers, software and data engineers, and organizers.

Most of the pointing out opportunities for fraud comes from a place of like, reasoning from first principles. But elections are huge undertakings involving tons of people. It's hard to successfully commit election fraud at a large enough scale to sway a federal election. It's why foreign adversaries prefer to swarm social media with bots: it has a chance of working.