Meta has an actual moat due to network effects. But yes, I think buying real estate, mineral stocks, etc. is overall a more effective and ethical way to invest for AGI.
I'd ask my AGI to iterate on a social app until it becomes bigger/better than Instagram.
If AGI is the reason you don't think Nvidia's stock is worth buying, then nothing is worth buying.
You're right that perhaps real estate/physical things will become more important. But whose to say AGI can't invent an asteroid mining industry and we get unlimited minerals?