TIL matrix.org has a working MUC server.

https://t2bot.io/docs/2020-matrix-org-lag/ > The specification only allows for a server to send 50 PDUs (persistent events) and 100 EDUs (ephemeral events) in a single transaction, and only one transaction at a time. This is to prevent the remote server from having problems with extremely large transactions and returning an "entity too large" error back.

Всё что вы хотели знать о процессе разработки, отношении к безопасности и цензуре в matrix: // ща уже всё потёрли https://web.archive.org/web/20190412143908/https://github.com/matrix-org/matrix.org/issues/357 https://web.archive.org/web/20190412143913/https://github.com/matrix-org/matrix.org/issues/358 https://web.archive.org/web/20190412143918/https://github.com/matrix-org/matrix.org/issues/359 https://web.archive.org/web/20190412143922/https://github.com/matrix-org/matrix.org/issues/360 https://web.archive.org/web/20190412143927/https://github.com/matrix-org/matrix.org/issues/361 https://web.archive.org/web/20190412143931/https://github.com/matrix-org/matrix.org/issues/362 https://web.archive.org/web/20190412143936/https://github.com/matrix-org/matrix.org/issues/363 https://web.archive.org/web/20190412143941/https://github.com/matrix-org/matrix.org/issues/364 https://web.archive.org/web/20190412143946/https://github.com/matrix-org/matrix.org/issues/365