The older something is, the more people grow used to it, but also have had a chance to get burned by it:

• C was released in 1972 (52 years), C99 was released in 1999 (25 years), hasn’t changed much since
• C++ was released in 1998 (26 years), there are 7 versions of C++ with notable changes
• Rust was released in 2015 (9 years), it’s still on the same 1.x version implying backwards compatibility

Rust was created to fix some of the problems C and C++ have had for decades, it’s only logical that people like it more… for now.