Google the giant will only bend when lawsuit happens. Assuming Google's AI put an urgent email to spam by mistake and made a huge loss to some party, Google should be immediately sued, probably by class action, only then it will respect small and well-behaved players like the original post here. Whenever I read post like this, I recall its once popular(now withdrawn) slogan "don't be evil".
Email is not an appropriate method of communication for highly urgent, impactful, and time-sensitive messages. So the party should sue themselves for negligence.