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I just yesterday saw a post how disabling downvotes for an instance that still acts as part of the greater fediverse causes issues and unfair advantages with posts being created there that can achieve a high score very easily, even on accident.
I would expect Lemmy to rework that function to avoid these issues so that up- and downvotes are either mandatory or can only be disabled together. I would not recommend trying to find an instance based on if they practice this most likely not here to stay functionality.
But the speed doesn’t really matter, so it shouldn’t be very energy intensive at all. Just gather up some junk, launch it at the sun with an expendable thruster, and be done with it. If it travels at a couple hundred kph, or even less is completely irrelevant. Let it take a couple hundred years to get there, it is supposed to burn up anyway no? And if it collides or is otherwise destroyed en route during that time won’t matter much either.