It is a license problem. The license condition of the SDK which is required to build the client app change to limit the usage of it. The new license states that you can only use the Bitwarden SDK for Bitwarden. It is against the Freedoom-0 of the Free Software Foundation. The limitation of English language is that it is hard to differentiate between Free (as in Free bear) and Free (as in Freedoom). Also open source which could mean complaining with FOSS and that source is available. This been unfortunately have been abused before.
I was referring to this which started it all.