The purple-matrix-0.20191228 package failed to connect to matrix.org for me within Pidgin so I started digging. According to the README in their Github repo, as of 2022/04/11 the project is considered unmaintained and doesn't support features such as end-to-end encryption:
https://github.com/matrix-org/purple-matrix/ Seems like this should be removed from ports. Thanks, Chad
