Gregory's Server@IzzyOnDroid I am still not entirely sure what "basic chat functionality" is supposed to mean but you are right. I have even seen arguments about possibly having to accept every server in the group chat indivitually but I highly doubt it will include public rooms. I know many people that I communicate with using SMS because all they have is Whatsapp and their reason against alternatives is a lack of acceas to all their contacts, I wouldn't communicate with Whatsapp directly but they would!
@IzzyOnDroid To me it's more of a killer argument to install every none tech savy person Signal than beneficial to my personal usage and that would be highly beneficial to my personal usage. You are absolutely right tho, with the wrong implementation this could end in a catastophy for privacy! I feel like the GDPR already prevents a lot of the worse case scenarios, including yours.