People don't download Chrome because EdgeHTML-Edge sucks; they download Chrome because it's familiar, and ironically doesn't nag the person to enable half a dozen Microsoft's services one by one. There's two greater truths here: that some people are more comfortable using Google's services over those of Microsoft, and that the power of defaults matter, even when they feel skeevy to a part of the population. Google proved that defaulting to all the services enabled by default is reasonable not just with a discretionary application (like Chrome) but also when the user barely has any other choice on the device (like Android), and years of these defaults have resulted in a userbase that relies on them and seeks out the product for this reason.

It also shows that past precedent can lead you down a gauntlet of bad PR: Microsoft has tried to be pushy with many features of Windows 10 (telemetry, inking, online login, Cortana, always-online search) in the same vein that we've long seen from Google, but their strategy contrasts unfavorably against long legacy of a less invasive Windows. Google has pursued a policy of opt-out from the beginning, and by doing so they escape a fair bit a bad press.

Firefox has the worst of it: their users are the most discriminating, the hardest to please -- even if some of Mozilla's controversies were poor choices, the level of uproar was immense. Posts like this just encourage the migration of users driven by causes. This would be less of an issue if it were entirely community-supported, but Mozilla has paid developers and evangelists, and deriving revenues from a discriminating userbase is a challenge.