Except that chromium is open source. Plenty of alternate browsers exist and at least one has big backing (Edge). It's not a bad thing for there to be only one

Except that chromium is open source. Plenty of alternate browsers exist and at least one has big backing (Edge). It's not a bad thing for there to be only one HTML & JavaScript engine that you have to deal with. In fact it's the opposite. The dominance of Chrome has made development much easier.