This is true and public knowledge though as I said (details seen here in the “Steam Key Rules and Guidelines” section), if anything Valve is giving devs a lot of leeway by allowing them to do that at all, not only are they giving up their 30% cut but are also then distributing and committing to updating those copies of the game for free
Every single one of your upvotes on lemmy is already public due to how the protocol works, it’s just currently obscured by a bit of work to get them (have to run your own instance, assuming there already isn’t some online tool to easily look them up)
Making them publicly and easily visible would only remove the illusion of privacy we currently have, not actually make your upvote logs less secured in any way