> This was proven with WhatsApp not too long ago and Signal also has the ability to attach users.

That maybe true for Whatsapp but Signal has worked hard to tackle that.

Adding users to groups is not possible unless they are already in your contacts in the first place, as Signal pull contacts from your local contacts. But they never share the number, and only if other people have that same number already in their contacts will it be show to both parties.

edit:

> Default settings in Telegram aren’t encrypted, same with Signal

That is plain wrong. Telegram does not encrypt by default and not at all in channels. Signal ALWAYS encrypts for one to one and for group chats.

I am not going to go through picking apart all you said, suffice to say not all of it is accurate.