Basically, simulating a WebRTC call allows a user to access the Tor network in a country where connections are monitored. Through NAT Traversal two users are brought into communication without opening any ports to the outside of the network

https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/wikis/Technical Overview

It’s an alpha release :)

Yes the development of OpenBoard has been at a standstill for some time, this fork has added various functionalities

No from tor.taxi

For me it’s working

Same for me on Graphene os