Michał "rysiek" Woźniak · 🇺🇦@hacknorris because IRC is not "web".
Also because every line of code is a potential security issue, and adds maintenance overhead.
Adding RSS/Atom support is relatively few lines of code for the functionality gained, because most of the stuff needed for those is already implemented by any web browser.
IRC is a completely, utterly different stack. And deserves a separate piece of software to do it justice.
All GNU social JP content and data are available under the