No warning.
No explanation other than "suspicious activity" or "violation of [vaguely worded] policy."
No human to call who can help troubleshoot, other than a tech-savvy friend or relative.
No recourse.
There needs to be a technology bill of rights, not just for people dealing with Google, Amazon, Apple, and Facebook, but also the myriad other technology operators which can disrupt our lives in an instant with some poorly programmed process or unanticipated edge case. Ultimately, the OP or my non-tech savvy employee or my mother should be able to get real answers and/or help from a human being when wronged by Google, a telco, or the local bank.