> independent from Google

Not really: https://news.ycombinator.com/item?id=38253384

Unlike Firefox, Safari has another huge corporate backer (Apple). Apple is drowning in cash. They don't need Google's money to keep developing Safari. It's "just" a good, low-effort deal for them. Apple doesn't have a competing search engine, or an intention to develop one, or an intention to promote a free web and "save" their users from a search engine monopoly.