Yes, probably but they are “easily” replaced. More easily than Signal in any case.
replyAlso if we go down this road, we’re all depending on our internet access provider at the very least too! At some point we gotta know when to stop trying to be fully independent from the rest of the world. He chose there.
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replyThere are obviously other CDNs (or whatever Cloudflare considers itself to be these days) and other certificate authorities. They are all interchangeable thanks to open protocols (HTTP, TLS/ACME in this case). Contrasted to Signal: there are no other implementations.
replyRe: Signal, it's even worse: they are openly opposed to federation and to letting alternative clients use their server. They demand control and obedience, which has always been suspicious-enough to defeat any goodwill effort on their side. Why would I have/want to trust them when XMPP is a viable federated alternative?
replyNot really. If their own their domain, then it's possible to swap out CF and LE for different companies.
replyThat would certainly be a very annoying event, but not an unrecoverable one.