There is nothing that says they get any financial gain from Apple, Amazon, Google, Door Dash, Uber, Lyft, etc
https://docs.house.gov/meetings/JU/JU00/20260204/118923/HHRG-119-JU00-20260204-SD038.pdf
"Apple has also opposed antitrust legislation in more direct ways. CEO Tim Cook publicly spoke out against legislation that would require Apple to allow sideloading, and the company ramped up federal lobbying expenditures and became one of the main funders of a new group called the Chamber of Progress"
https://www.cnbc.com/2022/01/18/apple-says-antitrust-bills-increase-risk-of-iphone-security-breaches.html
Amazon, Apple, Google and Meta are among the Chamber of Progress’ backers.
https://www.lobbyfacts.eu/datacard/chamber-of-progress?rid=882546891537-88
The Chamber of Progress, a US-based association that has been heavily criticised as a Big Tech front group, was present at Apple’s workshop. The Chamber of Progress is funded by Amazon, Apple, ByteDance, Alphabet, and Meta, but did not disclose this in its registration.
https://www.lobbyfacts.eu/datacard/apple-inc?rid=588327811384-96
Registration as it was on 17 Mar 2026....The Chamber of Progress.....
https://appleinsider.com/articles/25/09/09/big-tech-moves-to-hedge-bets-with-democrats-ahead-of-2026-midterms
AppleInsider is slightly cryptic about it.
Now Apple, Google, and more are trying to mend fences."these firms(SIC) have formed a lobbying group"
AppleInsider says "these firms" AKA Apple and Google, but no matter because AppleInsider quotes directly from Bloomberg, which is in no ways vague about it.
https://www.bloomberg.com/news/articles/2025-09-09/big-tech-seeks-to-bolster-democratic-ties-ahead-of-2026-election
A tech association funded by Apple Inc., Alphabet Inc.’s Google and other major tech companies is launching a new initiative to strengthen the frayed relationship between Democrats and Silicon Valley ahead of the 2026 midterm elections.Though Washington is currently dominated by tech-friendly Republicans, the initiative launched by the tech group Chamber of Progress allows the industry to prepare for potential Democratic wins in next year’s congressional elections or the 2028 presidential election.
https://ny1.com/nyc/all-boroughs/ap-top-news/2025/03/06/utah-becomes-the-first-state-to-pass-legislation-requiring-app-stores-to-verify-ages
Apple and Google are among a litany of tech companies that help support the Chamber of Progress
https://www.bbc.com/news/articles/c4g7k7zdd0zo
A joint amicus filing, a filing by parties with a strong interest in a case, also came from several groups, including Chamber of Progress. The tech advocacy group, funded by and representing Google, Apple, Amazon, Nvidia and many other tech companies, said they shared concerns over the government punishing Anthropic for public speech.
You have a strange definition of the word "partners." Partners = "its funded by"
It's Apple, and it's the Chamber of Progress. And others well documented(like Google) but who have no willfully blind defenders so far around here.