This is a fair question. I also begs the question of why we should trust other browser vendors. Google's business model seems to be mostly advertising related.

This is a fair question. I also begs the question of why we should trust other browser vendors. Google's business model seems to be mostly advertising related. This doesn't align particularly well with the interests of individuals using Chrome. Apple's business model has been more hardware-sales oriented, which might mean their browser exists to keep customers happy with their hardware, which might be a better fit. Mozilla exists for the public good, thought it does have some financial pressure to keep the lights on. Disclosure: My business has done work for Mozilla in the past.