Because the designer of this contraption does not appear in the video. I therefore do not believe there was a designer. A s designer is just a figment of our imaginations, because we have the mistaken sense that there needs to be designer. Perhaps it is due to problems we had with our father’s not playing enough lego with us as children. I therefore assume that this lego “machine” exists because of the random collation of lego bricks. After all given enough time any possible configuration of lego bricks is possible.
Some internet wag has put it this way:
Atheism the belief there was nothing and nothing happened to nothing and then nothing magically exploded for no reason, creating everything and then a bunch of everything magically rearranged itself for no reason whatsoever into self replicating bits that turned itself into dinosaurs… makes perfect sense.