Apple/macos and data collection

I want to protect myself against data harvesting by big tech, and wondering if there has been any research into how much data macos actually collects

I believe recently it was uncovered that even if you opt out from location tracking macos still pinged apple’s servers about ur location?

And so that got me wondering if there has been any research to verify apple’s claims… Maybe they send my misspellings back to “”“improve your experience”“”…

p.s. for the record i’m using macbook air m4, on lockdown mode, firewall, with as much privacy toggles adjusted as possible.