Cool, thank you, that makes sense. 

Three more questions if you want to answer
 - can I use my own relay? 
 - how would you compare keychat to SimpleX and Signal? When would you use which?
 - groups support?

I'm going to set it up, play with it and update:

https://juraj.bednar.io/en/blog-en/2022/05/03/encrypted-messengers-comparison/ 

 1、yes, of course.  see below note.

nostr:note15sza0s4yrxzx35cn3cs5xarxd48h7tgc5eyy4x0ml98jqfrk92gswyvhc8

2、 see below note 

nostr:note186wfn3zdrds9g3k2rgqxtzxxr3azfzr3vz6aa68c52kns7wqpduspmk2hh

3、yes, two kinds of group. 

nostr:note1927pnd00l22umju9xldyjc3xsrhn28tk0rxczn50pygwaft5h8kqcex9y9