Is this proposing simply that googlebot merely a web-rendering engine (a web browser) or is it saying that googlebot is crowd sourced web crawling performed by

Is this proposing simply that googlebot merely a web-rendering engine (a web browser) or is it saying that googlebot is crowd sourced web crawling performed by everyone using chrome? It sounds like the former, which is rather boring and kinda obvious, since the ability to crawl js-based websites requires "a browser" of sorts to render the content...