This is a bit mean. You do not know the circumstances of OP. Do you know them personally to be able to say this? Is this so-called more ethical company going to pay them the same or give them the same sort of pay and benefits? What if this person has a spouse, or children that need specialised care that costs a lot? What if they also have a mortgage and provide for their parents as well as their family?

Just saying "Please don't work for Facebook" is just so tone-deaf. Maybe YOU can work for a more ethical company, doesn't mean OP can.