The days are long gone when open source software was primarily the work of hobbyists and lone developers, your impression is sorely out of date. While independent developers are still an important part of the open source community, today much of the work on open source projects is being done by corporate developers.
Linux founder Linus Torvalds acknowledged this corporate influence and welcomed it. "It's very important to have companies in open source," he said. "It's one thing I have been very happy about."