1. Trezor, Ledger etc are neither airgapped nor btc-only firmware. The only real difference could be multisig but I genuinely don't understand why you say it would be less secure? As for people forcing you to sign a transaction on the street, I seriously doubt that's a casual occurence, sure, there are edge-cases and dangerous locations where it could happen but it's just that, an improbable edge case. I genuinely believe it is much safer to have a ringwallet than any other software wallet (1), and in regards to comparisons with Ledger, Trezor etc the only differnece is you would have it on you, but say you have 2 rings, one you keep at home and one you keep on you. How is the one left at home any less safe than the likes of Ledger or Trezor? Considering it uses Shamir, the chip has a higher EAL rating and there's no bluetooth, wifi, inputs etc it's arguably safer than ledger or trezor.

To answer the question directly, we obviously don't recommend you go walk in a cartel-controlled neighbourhood with a ringwallet holding $1M on it, but that's completely unrelated to the technology or even the ring. You shouldn't go walk in that neighbourhoud, period. And if you do, you shouldn't have anything valuable on you, period. Because chances are whatever you have will be lost if you don't end up dead either way. Whether you have a trezor, ledger, ringwallet, nunchuck etc, the same would happen. That's not normal use case though. I highly doubt you'll be held at gunpoint on a random street/boulevard in the vast majority of countries for you to transfer the contents of your ringwallet. Especially because this is not something instant, it would take at the very least several minutes for the entire thing to happen; time in which what no one notices? It's just highly highly unlikely. And that's not even mentioning the fact that the ring has 0 markings on it of any way, there's just a very small logo on the inside of the ring. That's all.

2. Nunchuck is also a NFC card so not sure how it's safer but that's not important; I doubt that nunchuck can be run on bluewallet or sparrow software; both of which are software-wallets and genuinely less safe than a hardware solution; pretty much any hardware solution.

As for the open source part, that I genuinely understand and agree with, but as mentioned, our plan is to make it open-source, I just want us to have some time-limited legal protection from competitors just forking our code the very next day. As for us having a copy of all generated private keys, we will be using the official industry standard SLIP-0039 implementation of Shamir's Secret from Satoshi Labs which is open source, the only difference being we store it on Ace Cards as opposed to a piece of paper. Either way, with a bit of luck on the legal side I'm hopeful that it won't be long before releasing the entire code as open-source.

Basically my only wish is for us to have a 2-3 year time horizon on every release before it can be forked in a commercially product, that's all. Which is a fair thing to want I believe.