Agreed, I am incredibly confused by what seems to be the majority reaction to this.
I've never been particularly involved with the FOSS community, though I do use a few FOSS apps and generally appreciate their view on what FOSS means. I also strongly appreciate data privacy, and it was my observation that the FOSS community was (generally) relatively the same way. So to see this reaction is very surprising. It's quite literally the same terrible argument of "Why fear it if you have nothing to hide" used against multiple data privacy concerns throughout the years.
I think the worst are the bad faith "But Reddit...!" arguments. For one, we're not on Reddit anymore, this is about Lemmy's issues that can be corrected. And for two, whilst Reddit potentially outsourcing that data to the highest bidder is far from ideal, at the very least the data wasn't outright PUBLIC to anyone who wishes to set up a simple server.
Then they should do so, these issues need to be fixed ASAP.
Obfuscating user IDs via a hash or something would seem like the way to make it work. I'm not a professional programmer, I only know a little bit of python, so I have no idea if I'm talking nonsense on that front. And whilst still not an ideal solution, but sharing non-private votes with your own instance admin and have them share only the total vote count with other instances is another solution. That way you need only trust your instance admin, which is choosable and can also be yourself.
Putting the onus on me is a shitty thing to do. I'm not the one running this site in any capacity, but this is an issue that many users are unhappy with. If the issue with the site won't or even can't be fixed, then I will simply not use the site. I don't know how many people feel the same on that front, but I'd imagine there's quite a few.