You are doing a whataboutism just like many others. Among FAANG, Facebook is distinctly more problematic. If you don't see that, you are just unaware of the scandals upon scandals from the last 5 years.
They have the power to choose not to work there.
Is one held to this standard if they are a facebook engineer? What about a FB bus driver? house keeping staff? kitchen or security staff, content moderators? contractors? Just trying to gauge the paycheck $ value at which the conscience should awaken.
It's like asking the frycook to quit his job because the CxOs lead the company to make very tasty but unhealthy food, it's so good it's almost addictive. Surely the frycook has a conscience, no? Soon all the frycooks in the world will refuse to work there and we would have solved the problem!
No, I don't think anyone should use any facebook tools either. It's perfectly doable.
The company needs to die.
If you have moral issues with a company, you should have it with all companies, regardless if one is more or less problematic. Otherwise, it’s just hypocrisy.