What does "free" truly mean when it comes to billion dollar companies?

If you think your data is safe in the hands of a company that gives zero shits about its workers. You need to get your brain scanned for cancer. First you get the money. Then you get the power.... The 3rd part of that brilliant quote you already know. Fill in the _____.

Everything about is being bought, sold, mined, bought again... Rinse / repeat.

Here is the TL:DR version: If something is free, it's bullshit and they just want your data.