I think the concept of making a simple SDK for embedding tunneling in apps is unique and very compelling.
However, for me to commit to a platform like that, the most important question is: if upstream changes their license, runs out of money, or just generally takes things in a direction I don't like, what are my options?
Ideally, the platform would be so simple that I can just fork it myself or with a small team without too much effort. The best way to create a platform like this is to build around simple, open protocols. I've never gotten the feeling OpenZiti is designed this way. I've never found any documentation on the network protocol. Your platform also offers many features I don't need, which makes it even higher risk to consider forking.
Note that I'm not trying to say you're doing something wrong. I'm not aware of any tunneling platform that provides this, which is why I'm currently building one myself (a successor to boringproxy).
I get the feeling OpenZiti is rather enterprise focused. And that makes sense, it's almost certainly where all the money is. I really hope you guys are able to prove the value of app-embedded tunneling.
But I'm looking for a very simple consumer product/platform.