Because C is an exceptionally unopinionated language. For some people having a programming language that doesn't have a strong opinion on how things are supposed to work is a good thing.

Most modern languages start with fixing C's warts (good) but then at some point turn into 'tech manifestos' (for lack of a better word). C is refreshingly devoid of opinion and that's what makes it so extremely flexible and timeless.

Embedded programming is still in C for a lot of micro controllers and whatnot. If you’re programming with limited resources it’s essential to understand pointers and arrays. Likely you won’t be doing anything useful without them

Because half the world revolves around C fundamentals, sadly enough. Things would be a lot better if there existed a non-C portable way to share libraries across language boundaries (including libC).

https://www.tiobe.com/tiobe-index/

And yet so few other languages attempt to have a stable ABI (other than by...mimicking C).