By default it includes pretty much everything anyone uses. Imagine installing the most popular 90% of PyPI or CPAN, and that probably gets the idea across. Without documentation (online is usually easier) and support for umpteen languages, it's less than half that amount of space. Even better, most of it is platform independent, so can be shared between operating systems; I use the Linux installer in WSL and tell it to install the Windows binaries, and it takes barely any more space but can be used transparently from either OS.