Now that we know the ‘Duty To Warn’ letter written by Stephen Spoonamore is misleading per Snopes as discussed here: https://lemmy.world/post/22317681, I figured it was worth mentioning there is another unrelated letter with a similar message that seems more credible. The letter is linked in the article, but here’s a direct link for the curious: https://freespeechforpeople.org/wp-content/uploads/2024/11/letter-to-vp-harris-111324-1.pdf
The election machines have always been and always will be vulnerable. See the tom scott video on the issue.
There was also a documentary way back in 2006 called Hacking Democracy that showed Diebold voting machines that are still in use today could be hacked: https://en.m.wikipedia.org/wiki/Hacking_Democracy