> I'm fully putting the responsibility to build the relevant plugins for Pidgin on the creators of the new chat systems
well that is not how it works, and it wasn't the creators of all that protocols you mention the ones that added support for it into Pidgin Instant Messenger (npub1v2r…kmxu), which is not the only multi-messenger out there, it is up to the pidgin developers and community to add support and create plugins for new protocols