Now, yes, but it wouldn't have so much corporate backing now without all the hobbyist contributors before. And even now there are so many OSS projects, so many

Now, yes, but it wouldn't have so much corporate backing now without all the hobbyist contributors before. And even now there are so many OSS projects, so many core libraries that entire industries and businesses are reliant on which are kept alive by a handful of people or even just a single person with no corporate backing at all. Corporate backing is the exception, not the rule.