Hey security peeps how do you think group chats are security protected? Are they really end to end encrypted?

I saw a YouTube video which explained why it's much more difficult than a chat between two persons.

Depends on the messenger. Some do not have E2E for groups.

WhatsApp? Yes.
Telegram? No.
Signal? Of course.
Threema? Yes.
XMPP? Only with OMEMO.
...

I do trust the Signal protocol.

Internally, group chats are just messages encrypted for multiple recipients.

@iKameo Signal is open source.

@iKameo As far I know, the Signal author helped WhatsApp to implement their encryption and Threema was reverse engineered.
OMEMO is the Signal protocol for XMPP where most of the implementations are open source.

@iKameo Go read the source, dummy.
That's all the hard facts you need.