If Discord had the possibility of Slack's channel system (everyone can create one, you choose which ones to join) then it'd be perfect.
For a very small remote organization, Discord would definitely be my go-to choice to start with, but privacy concerns and the fact that it stops working well with more people involved would eventually be a blocker.
Hey, my team and I were inspired by this exact use case and have been building something on our own. If you're interested please shoot me an email at xzhao254[at]gmail I would love to get your thoughts on it and maybe have you try it out.