I’m not 100% sure, maybe someone can correct me but the fediverse and Threadiverse, unlike Reddit, don’t show up in search results. Nowadays when you Google something you get to see Reddit posts and comments talking about your issue which generates traffic for Reddit and also makes users sign up for an account and contribute.
I know the amount of votes has to be shared, but I don’t see why other moderators (hell, even mods of the main instance) need to be able to see who voted on what