The Linux foundation is not a nonprofit. It is registered as a 501c6, basically a business consortium, unlike the Python software foundation which is a nonprofit (501c3).

The Linux foundation also stewards way more foundations and projects that just "Linux". They are, among other things, in the business of creating foundations and making money that way. For every organization under the Linux foundation, say the CNCF, to be a part of those subprojects, you need to pay a Linux foundation tax.

The Python Software foundation I don't know much about but their scope seems to be only stewarding python. They seem to have far less corporate outreach then the Linux foundation.

Linux Foundation 990 - note page 16-17 with the salaries - there are for profit entity salaries, not nonprofit salaries.

https://apps.irs.gov/pub/epostcard/cor/460503801_201812_990O...