That workaround is obviously not ideal & still requires an account (& possibly a phone number too). And your private message will still be logged. And using the service also still causes a big issue for search as you can’t find solutions using an engine like you could with a forum.
If there are the resources a community would self-host a decentralized, federated server where users are in control of their account/data along with the community in control of moderation, bans, CoC, ToS… & then bridge to other services from that base if they are seen as useful. If a community has less resources certain servers use less resources—especially if the server isn’t supposed to hold the entire history (which these chat rooms shouldn’t be seen as a place for permanent decision making anyhow).
If there are the resources a community would self-host a decentralized, federated server where users are in control of their account/data along with the community in control of moderation, bans, CoC, ToS… & then bridge to other services from that base if they are seen as useful. If a community has less resources certain servers use less resources—especially if the server isn’t supposed to hold the entire history (which these chat rooms shouldn’t be seen as a place for permanent decision making anyhow).