Go has a very full featured standard library.

It's simple (do you really ask why that's a selling point?)

It's fast to compile.

It's fast to run.

It's good with parallelism.

It has myriads of examples, and LLMs can pick it up well too.

It has good backing.

It has good tooling.

It's fun.

It statically compiles to a trivially deployable binary.

It's excellent at cross compiling.

It has good adoption.