Absolutely a serious question here: what is the big deal with companies e.g. Facebook and Google using your data for profit? These companies provide services that you , a user of their platforms, want. Providing those services is not free, and yet the prevailing sentiment across the internet seems to be, "Wow, I can't believe FB was using my data to sell me ads!"
Just one example: Imagine a group of people where you are one of the few people without a Facebook account. Then there is some group pressure to push you into becoming a Facebook user and since they don't offer a paid service, you either have to convince a lot of people to use some other medium, sell your personal information or accept missing a lot of communication.
This is peer pressure and has nothing to do with the way Facebook monetize its product.