It is actually not so hard to support different browsers. You can use standard APIs that are managed by W3C and work across (almost) all browsers.
But if one browser or company has monopoly (which Google currently has), they can create their own APIs that works how they want and not how users or developers want. Sadly, developers have to adopt that new API even if it is not good or even throw away good old API because Google didn't like it (like that recent one about ad blocking).
Also, if you leave Chrome and then use another Chromium based browser, this wouldn't stop Google's monopoly. Even if Chromium is open source, it is still managed by Google so they can do whatever they want.
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It is actually not so hard to support different browsers. You can use standard APIs that are managed by W3C and work across (almost) all browsers.
But if one browser or company has monopoly (which Google currently has), they can create their own APIs that works how they want and not how users or developers want. Sadly, developers have to adopt that new API even if it is not good or even throw away good old API because Google didn't like it (like that recent one about ad blocking).
Also, if you leave Chrome and then use another Chromium based browser, this wouldn't stop Google's monopoly. Even if Chromium is open source, it is still managed by Google so they can do whatever they want.