This is the conflict at the center of running a hosting company - make it easy to signup and you get a lot of new users but also a lot of abuse.
replyImplement anti-abuse measures and you will hit some loud false positives (this may be the case with GCP here).
I don't envy anybody running a hosting co - the internet is a really ugly place under the surface.
edit: to add - AWS are really good here. Must be the ~30 years of retail fraud and abuse experience.
I continue to receive phishing via AWS pretending to be Amazon. And not even the Unicode-lookalike shenanigans that my spam filter refuses for excessive mixed scripts, no; literally claiming to be Amazon as in: the company that operates the relay.
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