Can you explain what is wrong with engineers working on problems like these?

As I see this, it allows businesses to connect with more people, therefore being more profitable, therefore making economy grow in general.

I just don't understand this hate towards developers who work for companies like FB and Google and whose job is focusing on increasing ad engagement. In my opinion, they definitely provide a hugely positive effect on economy (unless you think capitalism / consumerism is evil / wrong or whatever, which is another topic).