Those who care about preservation and community development do. Others don't care or their bosses don't even understand the idea and don't let them. They might

Those who care about preservation and community development do. Others don't care or their bosses don't even understand the idea and don't let them. They might think spending on lawyers to ensure opening the code up is handled correctly is an unnecessary expense because they only understand expenses for profit. TL;DR: it's a non profit endeavor, and most of these companies don't grok the concept.