Request #18259 has been accepted by diabonas [1]: According to the upstream repository (https://github.com/RicinApp/Ricin) Ricin has been replaced by Konv.im (https://github.com/SkyzohKey/Konv), which in turn has been replaced by The Universal Tox Client (https://github.com/TheToxProject/client) that has been dead since 2018 as well.
[1] https://aur.archlinux.org/account/diabonas/
