Indeed, likely as secure as the VPNs run by intelligence contractors.

1. iOS has well-known poorly documented zero-click exploits

2. Firms are required to retain your activity logs for 3 months

3. It is illegal for a firm to deny or disclose sealed warrants on US soil, and it is up to 1 judge whether to rummage through your trash. If I recall it was around 8 out of 18000 searches were rejected.

It is only about $23 to MITM someones phone now, and it is not always domestic agencies pulling that off. =3