Project looks very interesting! What hardware is supported? I've seen you product your own prototype board, but what about some off the shelf opensource openhardware solutions like BeagleBone Black or NextThing's CHIP?
Yeah. Back in the days in Poland, when communism was still 'live and well', every typewriter was registered. Also, phone calls were monitored, but at least they had the courtesy to play a message "calls are monitored" before each call.
Since you are UK-based and Snooper's Charter is a thing now, how will that affect Riot/Matrix? Will you be moving the official base to some countries with greater respect for privacy?
I'd rather have Bitcask or RocksDB - something that has better crash recovery capabilities. LevelDB was marked as being prone to data corruption. DETS has similar problems when not closed properly.
$65 a month?! shit,that's high! For 1GB od full speed internet, and after that unlimited lowspeed, with morze then enough calls, I pay $7.34 in Poland.
p.s. Carp is still actively maintained, should be on the other list.