Depends on the size of the account surely? Maybe there's some support person to talk to, but there's plenty of services I subscribe to fo $10-100/month and I dont have an account manager for any of them.
Google however is infamous for not providing support at all on all their services, even if your complete digital identity got killed off because some AI can't recognize that the "CSAM" you sent was in fact communication with your child's doctor [1].
[1] https://www.heise.de/news/Nacktscanner-Unbedachte-Fotos-vom-...
Because google choose to make this as difficult as possible. A couple of years ago I worked on a third party IAAS database cloud product (think Atlas or Elastic Cloud, but for a different database), and while Azure had the worst tech overall, Google were ultimately the hardest to deal with by a VERY long way because they don’t acknowledge the existence of people as anything other than ad targets.
Why should a business relationship with Google (or any other cloud service) be any different? I don't use GCP but if I was going to start, I would ensure that I have a person to call or its a non-starter.