How does a strong alternative help solving the following problem. Let's say you are a video service provider, and want to offer MPEG-DASH[1] based service which relies on browsers supporting Media Source Extensions[2].
Soon enough, you discover, that iOS users can't use your service, not only because iOS default browser doesn't support MSE, but because they can't even install any alternative that does (Apple doesn't let them).
You are literally forced to implement something[3] in addition to MPEG-DASH to address a substantial amount of Apple users and in the process potentially pay Apple and Co. for implementing it because they own related patents, or you need to agree to ignore them (which means a loss of money for you).
TL;DR: Apple stifled adoption of MPEG-DASH, and forced you to do double work and in theory can force you to pay them money too. This is just one example, there can be many like that, another big one is video codecs and etc., but you get the idea. All that bottlenecks on the same restriction - ban on competing browsers.
Shouldn't this be a subject of anti-trust regulation? If they managed to do it, they have enough control over the market. But again, may be anti-trust law simply isn't equipped to address this? I see it as a major problem.
1. https://en.wikipedia.org/wiki/Dynamic_Adaptive_Streaming_ove...