And Apple's restriction has nothing to do with "only 1 icon"; you can ship competing browsers, and in fact Google ships a "Chrome" on iOS.
The restriction is on the rendering engine.
And note that this restriction does not "serve the users". Users who want a faster, or safer, or more compatible browser with some favorite site of theirs that is pushing the envelope on mobile apps via the web are not able to use a better browsers with a better rendering engine.
Look at how many people run Chrome and Firefox on Windows and OS X, when there is an existing browser available. They are not all "developers"; they are users looking for faster rendering, more compatibility with services that are pushing the envelope of web apps, a safer experience, and the like.