I also rewrote the zPay.live backend in Go. It's not only 40% faster and 70% less compute-intensive but also highly scalable. 

Even with 10s of 1000s of users on your self-hosted version, you wouldn't break the AWS Lambda free limit, which is unimaginable with Lnbits or BTCPay servers.
https://i.imgur.com/GsdV03z.jpeg
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 That's pretty friggin rad. I'm not sure I could ever use this, but... The fact that you are doing it this way is remarkable!  

 I will also probably never use this service myself, but I want it to exist as a viable option for people who need it.