Not saying Rust is bad by any means, but it has about 20 times smaller market share than C++ according https://www.tiobe.com/tiobe-index/ and 11 times smaller according to http://pypl.github.io/PYPL.html.

Tiobe and PYPL are not market share indices, they're googling indices. I'd be very surprised if Rust really has 1/20 of C++'s market share as in number of companies and programmers that use it.

True, they are not great indices. Indeed.com shows me around 40 times more job openings for C++ and StackOverflow shows 14 times more C++ questions this year. Github shows 12 times more commits in C++ this year. None of these are great by themselves but a guess of around 20x seems reasonable.

Rust only reached 1.0 status in 2015, keep that in mind.