On iOS, Tor used to recommend using the Onion browser (they probably still do, I haven't checked). Some time ago, the onion browser changed how it connects to the Tor network to use Orbot instead of connecting directly.

I can not help but see this as a malicious change.

Orbot directs all traffic from my phone through the Tor network. If an iPhone is secretly pinging some backend server for telemetry / looking for automatic updates / etc, then all those pings will now happen from the Tor exit node, effectively completely deanonymizing the user.

It's a trivial matter for an adversarial agent to ask apple for lists of all hits from a specifc tor exit node and identifying information from that user, and cross check that against whatever traffic they are trying to deanonymize.

I might be misinformed here, but I would love to be corrected about why anyone should trust Tor enough to access it from an iPhone anymore.