Which companies are legally bound to lie to you? Wouldn't this be grounds for a legal case?
It's called a gag order, and while repulsive, it is QUITE legal, with a LONG history of use. If they, whoever that happens to be, were to make it known that they were collecting/passing on information while such an order is in place, they'd be hit with penalties that can range from a fine that means little or nothing, to something so nasty it's effectively the same as "We (the cops/FBI/whoever) now own you and all your assets, you're no longer in business, and you may be finding yourself in a prison cell in the not-too-distant future".
SOME places with content that could be considered "questionable" try to do an end-run around it (legality is iffy - some say it's the same as deliberately breaking the order, some claim it's not - sooner or later, it will end up in a court somewhere, and an actual legal determination will come down - for now, it is what it is) by putting up what's often called a "privacy canary" - yes, EXACTLY like the old "canary in the coal mine" - usually in the form of a snippet of text somewhere on the site, usually not screamingly obvious, often, but not always, as the last text at the bottom of the home page, but always placed so that if you go looking, you can find it if it's there. Wording varies, but generally it says something similar to "We have not been served with any sort of gag or surveillance order." If you see such wording on a site, keep an eye on it when you visit in the future - if/when they actually do get hit with such an order, the practice so far is to "kill the canary" - by removing the canary text from the site. If a site that you visit used to have a canary on previous visits, but doesn't on this visit, it's safest to assume that they've been handed some sort of "You WILL snitch to us on your users, and you WILL keep your mouth shut about getting this order" paperwork, and that every byte you send or receive is being logged and handed over, complete with your IP address, to SOMEBODY. Saying "we got a court order" would be breaking the order. Saying who that somebody is would be breaking the order. Killing the canary is in the legal shadow-land, but offers a way to at least throw out a "Heads-up! We've got the cops hanging over our (and therefore your) shoulder - watch what you say!" to their users.