Do you know where most of SpaceX's funding comes from? Companies who make money by selling ads.
Besides listen to it from Musks own mouth, "Meaning is about the delta between impact and scale. Whether you help millions of people share a photo more easily or send one person to mars."
If you work for a company selling ads, do you derive meaning from how the company invests its profits? Or from the direct effects your actions have on the world?
The rationalizations some people will accept to avoid taking responsibility for how they spend their own lives...
So you think it's an invalid argument because of where that person works? Seriously, who are you to judge how others spend their lives?
Do you go around telling construction workers that their life is meaningless and they should instead be building rockets to carry you to another planet?
Because it is a non sequitur. It fails to engage the point of the argument.
The point is that SpaceX is a making a potential contribution to humanity's future, which makes it a more meaningful way to spend your working years than an advertising company.
The fact that an advertising company thought that SpaceX was a good investment has absolutely nothing whatsoever to do with this argument. It completely misses the point.
Besides listen to it from Musks own mouth, "Meaning is about the delta between impact and scale. Whether you help millions of people share a photo more easily or send one person to mars."