It seems worth considering startups and entrenched near-monopoly situations differently. Competition is hard to bring back in the latter, and certainly consumer

It seems worth considering startups and entrenched near-monopoly situations differently. Competition is hard to bring back in the latter, and certainly consumers might well benefit from the right interventions. It doesn't mean a purist law to prohibit proprietary closed devices is necessary. And I'd argue with your example of Facebook that they should at minimum be compelled to enable universal linking so that other app vendors can intercept outbound links directly, and users can choose their web browser etc.