They aren’t E2EE so all messages and activity are recorded. They are subject to to very different rules than regular chats or groups.

Signal and whatsapp (due necessity) for daily life. Slack and email for work stuff. Rarely send personal emails anymore.

I Spanish, the Real academia de la lengua is often used incorrectly by people as a prescriptive reference but what they really do is gather the common usages and incorporate them into the language. It’s like a descriptive record of language.