Tesla reported a security vulnerability in the project, as they used it for accepting Bitcoin and treasury management of it. To me, this signals confidence in the project's application security posture.

https://www.coindesk.com/markets/2021/03/31/tesla-just-helpe...

https://twitter.com/BtcpayServer/status/1376962115504906240

https://github.com/btcpayserver/btcpayserver/releases/tag/v1...