Anyway, phpBB is still working, and contrary to Discord it is public: search engine can parse our messages, and everybody can read them directly without needing to subscribe to anything.
It's a software that "old" people already knows and it is still a service available in a lot of hosting services, without the need to manage yourself the security updates, etc.
I don't see clearly the advantages of phpBB over Reddit, but I know some people don't like Reddit, and other people don't know how to use it. (to be continued).
To have more information about phpBB, here's the link to their official forum: https://phpbbgroup.com/index.php