There have been plenty of browsers that were not part of a big company, either for part or all of their history. They don't tend to have massive market share, in part because browsers are amazingly complex and when they break, users get pissed because their browsing is affected.

Even the browsers created by individuals or small groups don't have, as far as I've ever seen, a "servant-oriented mindset": like all software projects, they are ultimately developed and supported at the discretion of their developer(s).

This is how you get interesting quirks like Opera including torrent support natively, or Brave bundling its own advertising/cryptocurrency thing.