It is a good outcome that we have for the web: good standards and a reference implementation in the form of WebKit/Blink.
This is a boon for web developers: follow the standards, but if there are gaps in the standard, check the behavior on Chrome. If there were multiple mainstream browser implementations with split market share; it would be painful for web developers. Large amounts of time and energy would be wasted on testing the web apps on every possible browser implementation. This is probably why platform technologies such as Operating Systems, browsers, etc. trend towards monopolies or duopolies. A highly fragmented market is not in users, developers, or even platform developers' best interests.
Chrome also has well-resourced competition in the form of Apple and Microsoft. As Chrome adds more user-hostile changes, users will switch away to friendlier browsers, such as Brave, Edge, Safari, etc.