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Plus most of these haven't reached critical mass / appeal, except Discord and Slack (out for the aforementioned reasons)... and IRC.
And so I'm left with the idea of just having a freenode channel, with @whitequark's logging bot in it, letting people bridge in via the Matrix bridge at least until that becomes a problem, and calling it a day...
Yes, it's terrible, it's plain text only, it has no sane file transfer, it has no log integration, it's not particularly newbie-friendly... but nothing else seems to be strictly better in enough ways.
And at least I already know how it works and so do most FOSS devs. 
I haven't made my decision yet, feel free to try to change my mind.
To everyone saying Discord this Discord that: look, I'm in more Discord servers than IRC channels these days, I get Discord. I still think it's not the right option for this project, and enough people I care about would never use it.
One thing that *might* end up happening is dev chat on IRC, user chat on Discord, or something along those lines.
The 'official' matrix bridge is pretty unreliable, but it gets a *lot* better if you selfhost it - we run one at @hackerspacepl and we haven't really had any major problems with it, except any self-inflicted damage.
Freenode irc + your own matrix bridge seems like the best imo, you retain full control and can also bridge in a bunch of other protocols via matrix
hmm could it be possible to require NickServ auth, or at least only for bridged users? or is creating new NickServ accounts too easy for their existence to help moderation in a significant way? at least I don't see Matrix being worse than IRC without something like NickServ
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Requirements: open protocol, data portability, cloud hosted (but option to self-host).
