A criminal org doesn’t need end-to-end encryption to be untouchable by the authorities, all it needs is an HTTPS web server with a login page. Those are cheap enough that any organisation with at least one full-time-equivalent person on their payroll can afford to change server every week.

The advantage of e2e is so a central chat server can’t be ordered to leak secrets; I can’t see how an org which doesn’t care about the law in general is going to care about that law in particular.