Wouldn't it be nice if there were companies that are owned by humanity in the sense that they are managed by democratic decisions where every person in the world has one equally weighted vote?
Here, various aspects of this idea can be discussed in detail.
Collecting votes is easy, any moderately competent CS grad could knock up a DB system to handle 7B votes.
The actually hard part, is authenticating those votes. How do you plan on authenticating every single vote was cast by the actual person, and not a fraudulently created vote spam account? This is a problem that no one really has a good answer for, and even many nations still struggle with.
That's a very good question and a difficult one to answer. I agree with you that this is probably one of the biggest problems with conducting online elections. I've created a separate post to brainstorm solutions to this problem: https://lemmy.ml/post/38752026
Decidim is a digital open-source platform for citizen participation that can also be used for online voting: https://decidim.org/