There's a link upstream of fully OSS LoRa alternatives. Your question to me makes no sense: it's like asking if the developers of those alternative technologies use 5G-enabled phones, even though those also use proprietary technologies.

Maybe I should clarify: existing tech is what it is. We probably have to use it. But if we're building new tech, why would we waste time doing it incorrectly, when we have the chance to do it right?