Some big tech companies even provide support for people who want to do this (of course, under certain constraints, and to a certain extent).
Then again, if you're comfortable at a big company and working on something as a hobby or side project, the impetus to get it done and move quickly isn't there as well. Plus, a steady, large income produces a sort of complacency and tendency towards a more expensive lifestyle that would be hard to sustain once you leave again. So I guess it's a double-edged sword.
Also, if you do this, it has to be at a company where the environment and the work you do isn't toxic, but rather something you enjoy. While I was at another company doing work I really didn't like, I thought to myself that I'd compensate by working on a side project. I was only fooling myself, because when I got home I was so bored, tired, and frustrated that I had no energy to do anything technical. Different personality types might cope differently, though.