>While Apple’s proprietary iMessage system already supported E2EE, this wasn’t extended to RCS messaging because the previous RCS standard didn’t provide cross-platform support. Google Messages also enabled E2EE by default for RCS texts, but only conversations between Google Messages users were E2EE, and not those exchanged with iMessage users or users of other RCS clients on Android.

this dances around, but does not seem to answer, the big question of whether android will get iMessage or not?