Any use of a non-e2e service as a replacement for an e2e service basically means either self-censorship or recklessness. The data is not going away, and if context changes can implicate everyone involved.
https://www.brainyquote.com/quotes/cardinal_richelieu_183310
It's also impossible to effectively self-censor in the present for potential content-based threats in the future.
Discord also bans certain entire domains from being sent as links in DM, as an antispam measure, and requires in their ToS that people give up their civil rights to join. It's not polite to ask friends to submit to third-party censorship of private conversations just to talk to you.
If Signal didn’t suck as much, my friends wouldn’t have left and I wouldn’t have followed them. It’s really that simple.