Julia has raised millions of dollars in funding, and includes some pretty big names- National Science Foundation, DARPA, and a pretty big chunk from venture capital as well. They don't have a benevolent sponsor like Python has enjoyed from Google, but they're doing alright.

They aren't as big as Python because Python has been around for nearly 30 years. Julia is just a baby compared to that. As it grows it will increase it's share. It may not ever surpass Python in terms of raw users, because Julia is focused on numerical computing, but Python is more general purpose.