If you refuse to upload your entire phonebook to Meta, the app will HATE you for it. You will not be able to initiate any chats, the other party needs to start

If you refuse to upload your entire phonebook to Meta, the app will HATE you for it. You will not be able to initiate any chats, the other party needs to start chatting you first. Also, instead of names, only phone numbers will be shown. (I cope by looking at avatars and inferring identity from the previous few messages.) This would all be easily fixable. You could be able to start a chat by entering (or, more realistically, copy-pasting) a phone number. And instead of a phone number, you could be shown the other person's profile name (like in Telegram).