That doesn't always (or usually) work in some of these BigCorps. It's not that they don't give you freedom to go ... do stuff -- they often do -- but there are also are often very concrete boundaries about who is allowed to actually have the stuff they do go into any kind of production codebase. And very rigorous review processes, etc. and often the first question in a code review on something exotic and new at a place like Google is: Where is the PRD / design doc for this? (aka who approved this)..
They are often not environments promoting spontaneous contributions, especially not not at the L3/L4/L5 aka lower part of the promotion ladder.
That and corporate survival / promo at these places really depends on "demonstrating impact", which, well, at the lower levels... can come down to sticking with doing what someone more senior than you expected you to do, taking ownership of it, and etc etc.
The reality is that many of the people spinning their wheels like this should just leave and go find a new job. But that's awfully hard to do when you are making sometimes twice as much as what a more "meaningful" job in e.g. a startup or small company can offer. Or when you're on an H1B, or you need certain medical care, etc. etc. etc.