The real threat is that politicians will step in and decide who can have a platform, how big it can be, and worse, who can use it.
Are these large conglomerates an issue, perhaps in areas of needing regulation to insure we have privacy and no not need to opt in. however they should be able to trade for rights as well and in no case should we ever allow politicians to determine what the platform is or who can use it.
Facebook is not all of the problem but it's definitely part of it. Facebook has clear privacy issues an implications and everyone uses it and knows about it. If highlighting its issues is a viable path to better privacy legislation and is the example that allows the bigger problems to be demonstrated to everyone, even non technical people, why not use it?
This ubiquitous practice of commenting on contentious topics using throwaways reveals much of that's wrong with HN culture.
At the same time, there is a large (20%-80%), vocal, and powerful fraction of tech employees that strongly and idealistically oppose that "SV policies [are] shaping public opinion", or that it's a potentially bad thing and not something we should strive for.
I see why someone would hesitate making that comment from their primary account.