The Google policy probably applies to personal devices used in BYOD work settings. Lots of people at tech companies use personal devices for work. This include

The Google policy probably applies to personal devices used in BYOD work settings. Lots of people at tech companies use personal devices for work. This includes things like having your work calendar, email, or corporate applications on your personal phone. In my company's case there is some kind of enterprise iOS policy that gets installed as part of onboarding a device to access company systems. This has the ability to enforce a password policy, monitor installed software and software versions, to lock out devices that are running known vulnerable apps or iOS versions, as well as the technical ability to remotely wipe the entire device (never heard of that being exercised). Company data resides on the device (via email, documents, and other means) so it's reasonable for them to want to have some oversight. An attacker could attempt to get into company systems via the device, after all, since it has (some limited) access to my corporate account. I use my personal phone for work because it's extremely handy to have work email and calendar on my phone, and I don't want to carry two phones.