It's not free of charge, you're just paying in a different way. These services are able to operate because they deliver content that changes your mind in a way that benefits the corporations who pay for ads. They alter your purchasing habits, sway you politically, and change your emotions. If they were not able to manipulate you then they would be worthless.
> If advertisers want to advertise to me, that's fine. I understand they need to make money.
I feel sad just reading that. Advertisers are paid to deliver targeted psychological manipulation to you, and yet you feel ashamed for making their work less profitable. It's like observing some kind of digital stockholm syndrome.
You can go back and efficiently run a new test across old commits.