[anticorporate]

In a nutshell, yes, but there are very few FOSS nonprofits with funding that allows them to do this. The Linux Foundation pays Linus, and I know the OpenInfra Foundation has a few technical roles on staff, but most simply don't have anywhere close to the money to pay for actual development. It's not a particularly attractive venture for corporate sponsors, or at least hasn't been historically, because they can spend the same money on their own developers and have much more control over what features and bugfixes get prioritized.