SMBC talks about this a fair amount…but my favorite is this one:
Because honestly, it seems like that’s all the simulation argument is. We know that lots of things designed to look like the universe will end up looking like the universe, so we say the universe should be one, despite having no knowledge of alternative chances. Humbabella gave some nice exposition about an argument the universe looks designed back here; I’m not sure why this one is any better for being simple.