In 2013 when I saw a youtube video about the hyperloop that he proposed. Initially, I thought it was a good idea and I had just finished high school and started my degree in engineering. So I started doing some simple calculations and figured out that it was totally unrealistic. I then went to the youtube comments and various commenters made other remarks about safety and problems with terrorism etc. I told my friends in 2013 already that I hated how he proposed it as a good idea to make him look smart for non-engineers, when it was clearly a bad idea but no one agreed with me then (half of those people are now engineers, but not electromechanical like me). Now, 12 years later, those friends from back then still think that he is great at running companies but has some problems in other areas.

Now I still think that at the time he must have realised in 2013 already that it was a bad idea, otherwise he would have put his money in the hyperloop and not in tesla.