> The FAQs say that the app is a p2p based app. What is the p2p protocol being used here? * How does it compare to libp2p, SSB, and others? * What's the security model, and how would the system mitigate Sybil attacks etc?
It's built from scratch. It runs c0 subprotocol of Mim. You can see some basic comparisons here: https://getaether.net/docs/how_is_it_different_from/
Other questions - all good questions, but it depends on what your definition of security model is. Sybil attacks are prevented by cryptographic signatures and proof of work. Unique names are available to provide a good human-friendly polish over cryptographic signatures, as well.
> Are there any plans to have mobile apps (preferable native)? I think if people could use it on their mobile phones, it would be a game changer.
Yes, I would _love_ to have mobile apps. The system supports it, but I don't have the money to spend the time building them, or to pay someone to build them. In essence, it depends on how popular the project gets - if enough people support it financially, it would certainly be a first priority.