To be fair, they were 'compulsory legal process', and almost certainly were accompanied by gag orders that have not been rescinded.
There are many kinds of domestic spying, referred to by their section of law. You've got 501, 1806, 1825, and 1845. All four can be used with gag orders. The ISP is basically forced to install hardware. They can chose to let the government do everything (and get paid for resources used), or install a tap themselves so the government can use it (and charge for resources used), or fight it (the tap still gets installed, but they don't get paid for resources used.)
Most of these come with gag orders: If you say anything, even hint that you might have known was was going on, and you risk violating the gag order.
There are very few business owners who have said anything about the process. Everyone should read Pete Ashdown's account. (He founded a major ISP in 1993, has run for senate, etc.) He describes receiving a FISA order, not being allowed to take notes or other details. Unlike most companies, he decided to isolate the customer's virtual machine to a single dedicated box, and then put the court-ordered recording box on that one specific box.
In the article he spends three paragraphs describing what the did, ending with "I can’t tell you all the details about it. I would love to tell you all the details, but I did get the gag order. I have probably told people too much. That was two years ago. If they want to come back and haunt me, fine.
When these executives are getting potentially a few dozen to a few hundred of these requests that include a gag order. None have revealed as much as Ashdown did in those few paragraphs, other than to say in corporate reports that they have received 0-999 such orders.