Pretty much

You can use whatever chat clients you want. Multi-billion dollar companies control your OS. They don’t need to sneak in a rootkit: The OS is their rootkit.

E2E encryption is theoretically nice in the event there is a man in the middle at the cell tower or company. It is of arguable (zero?) value in sim spoof situations. But it is better than not

But still, don’t trust it for anything that google/apple might care about. Because transmitting and processing voice is hard. Effectively grepping a screen for such dangerous words as “terorrism” and “union” is almost zero cost. Like, I don’t expect google to give a shit about if you like hookers or buy drugs or whatever. But if you are involved in anything that could impact their bottom line…