Welcome to our brave new digital world, governments and DOJs do this because now they can, I am afraid this is only the beginning.
How is this, in principle, any different from the DOJ using a subpoena to get customer records from an adult store that was allegedly selling illegal explicit material?
Just because you use the internet to commit the crime doesn't make it not a crime.
Tyranny comes and goes, and sometimes just changes shape and serves some more than others, and that gives the illusion to those it serves that it's gone. It's always been around in some form or another.
Democratic governments can be held accountable, corporations cannot.
The saddest part is, most people simply do not care, my parents constantly echo the sentiment that if I have nothing to hide, I have nothing to fear. I would argue this slippery slope came about 20+ years ago during the initial Patriot Act. They normalize the behavior, take a few more freedoms, and keep on trucking. I used to be proud to be American. Now I am just worried.