On Signal it is a group of your contacts, so it remains private conversation.

There is nothing publicly said, and it is not open for strangers to participate.

I don't see any compelling reason for Signal to evolve towards more SNSish groups, to the contrary, by remaining in the current state they avoid the costly conundrum of moderation.

> That's what non-tech people come for.

I disagree, people come to Signal for what it is. Arguably even more people would come if there was SNS features, but on the business/feasibility aspect (Signal is still an open-source based modest-size project), it would not be worth the cost and endless legal trouble of moderation in all the different countries with all the different laws.

Most importantly, introducing SNS would entail moderation which would fail the very purpose of Signal's existence (since the contents of the messages is ciphered and private).

In the end, actually less people would maybe come to Signal if it launched SNS features.