Beyond the purely technical API documentation, I saw a (small) number of what looked like an article tying an entire API together and explaining how it works, o

Beyond the purely technical API documentation, I saw a (small) number of what looked like an article tying an entire API together and explaining how it works, or giving examples, like https://developer.mozilla.org/en-US/docs/Web/API/WebRTC_API/Session_lifetime https://developer.mozilla.org/en-US/docs/Web/API/WebRTC_API/... Are those now going to be paywalled?