I read there is point 20 20. Open Source Components This Agreement acknowledges the use of open-source components in umbrelOS, which are governed by their respective licenses. Users must comply with the terms of these licenses when using the software. I do not know if I can freely use FOSS like BTCPay within non FOSS like Umbrel.
Most software allows it because they run in Docker. But AFAIK, you will definitely not violate any license, if including an app like BTCPay in Umbrel would be forbidden, it would be Umbrel's responsibility, not yours.
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