Are you a software developer?
Do you run macOS?
Do you frequently checkout files from third party code repositories?
Do you use an IDE like PHPStorm, Xcode, Atom, Netbeans, or something else?
Do you frequently run commands like npm install that reach out to the web and pull down a bajillion files you will literally never-ever open even if your life depended on it?
I do… and that’s why I block macOS Spotlight from indexing the parent directory to all of those files. It’s a dead simple and obvious thing to do once you think of it.