Out of interest, what censorship did you bump into with Discord?
This is a wall of text, so apologies in advance, but for those interested, here's my detailed answer.
Summary
On Discord I did not feel participatory (or was blocked from participation) and self-censored (or was censored by staunch though perhaps pigheaded technology choices). That said, I could always gain read-access, which was a "lifeline" indeed until SHNet rose up--so that was okay! Much gratitude for those behind/on the Discord, since that was useful, that's not the focus of this comment though.
Trouble signing in?
Chiming in here only because I have a somewhat relevant answer. The censorship I experienced on Discord was self-imposed, because I couldn't successfully confirm my registration on Discord and log into my reserved name. I was willing to sign up, and tried with numerous email addresses. However, Discord would not let me sign up in the way that I wanted to. Without having a persistent registration (ability to log in under the account name "reserved"), I had little enough traction/incentive/continuity-belief, definitely below participation threshold (would my access be suddenly cut off when the invite link expired, as another had?). I could PM but I'm not sure I could post in chat. Not that I had a ton to say/contribute, but still to connect and have more of a place.
Email provider discrimination?
It seemed that Discord might have wanted only an email address from a major provider (Google, Yahoo, AOL, MSN, Outlook, etc.). Discord would not let me register and log in with a ProtonMail account. Incidentally, the major providers all required mobile phone registration it seems, whereas I was satisfied with my non-mobile-requiring account (even though it may not be quite as privacy oriented as it is intended to be, this was one plus). I had generated some temporary email addresses prior to landing on ProtonMail for the purpose, but they had gotten me even less far as I recall.
Digits, please?
To me, the phone number is the obvious unique personal identifier for anything associated with that registration, along the lines of an SSN or UID. Sure who give's a rat's behind, this is a harmless community. But if I don't see a need to give it out to the software provisioner as a starting assumption, I would prefer not to. I tried all the temporary mobile verification sites/countries/numbers I could find to register a fresh account on a major email provider, but none worked. And I wasn't invested enough, I guess, to seek out some kind of 2fac auth service--though I am now aware there is a subreddit for that, that seems shady to me.
Proxy issue?
I am not sure if this had to do with my using the Tor browser for SH. AFAICT this is not against the rules, and I read the rules carefully. I know Tor is not perfect (and could be reverse perfect!), but my understanding is that by using the proxy someone somewhere else in a less free place might have a slightly better shot at open communication. And if it itself is a magnifying glass, I'm cool with that. But all I remember (and this was already blocked out by now) was Captcha after Captcha and reconnecting with different proxies to even get into the (pre-login functionality, likely ephemerally available, "read-only"?) interface. Total chore!
Compared with SHNetChat
To cut to the chase, I thank the stars (and admins, wittingly or by default) for the ability to smoothly register on SHNet a well as log into SHNetChat while still using preferred ProtonMail credentials and Tor browser. Seems basic, yet a major point of grace for the simple but principled little ol' me.
There, I have said too much but it is an example of censorship of sorts. Point not being to have a bulletproof argument but to share my story, especially since it may be the minority case. "For information purposes only."