Is it unethical to use Facebook/Google Ads?

Is it unethical to spend money on Facebook and Google Ads?

Below is an email that harshly criticized my use of (and recommendations to use) Facebook ads due to how unethical the company is. 

I’d like to know your reactions to it -- both the substance of the email (the issues) as well as how it came across to you.

After I share the email, I will share my thoughts about it, and also the comments from my clients when I anonymously shared this email with them. #element-6cf7119c-74ef-465c-9005-c5d892...