What data can apple give them?
https://www.theverge.com/2020/9/3/21420176/apple-ios-14-trac...
https://www.telegraph.co.uk/technology/2020/12/08/advertiser...
Who knows what other backroom deals are happening outside our knowledge. The only reason we found out about PRISM is because the gigantic scale and Snowden sacrificed Everything to let it be known.
Also how would we know if Apple is working with other companies? It's not like they are known to be transparent or Truthful.
Apple puts privacy and security front and center as part of their brand. They zig while everyone else is zaging, trying to make a buck on user data, which they don't do.
For starters, here's their transparency report: https://www.apple.com/legal/transparency/