I think what you are saying is probably correct, but remember what happened to MS and IE. IE was never forced, and other options weren't blocked. The issue was

I think what you are saying is probably correct, but remember what happened to MS and IE. IE was never forced, and other options weren't blocked. The issue was bundling and inability to uninstall due to tight coupling. Both of those would apply to iOS though the details and current political landscape would probably give them a pass.