I watched a youtuber that was using this, and the cost to print something was pretty high. Like a 2 inch by 2 inch tile with a little depth was like $2 USD for the ink/resin alone. A larger board that looked like it was about 1 ft by 2 ft, with a single layer of print (no depth), was about $25, IIRC.
It's beautiful, but so expensive to run, IMO.
A lot of people see an upvote as a signal that they endorse the message, or at least want it to spread.
A downvote is the opposite of that.
You'll never convince people not to "shoot the messenger" on link aggregators because it's antithetical to their view of the system.