According to this document, I would like to clarify that it’s advisable as a best practice to “use the security principle of least privilege to grant IAM roles, that is, only give the least amount of access necessary to your resources.”. If you require full privileges for some of your team members, you may grant them the “editor” role instead of “ Owner”, but you should even fine-tune this to match the least privilege principle. This should also avoid some members getting emails that are supposed to be addressed to the actual owner(s) of a project.
As for policy violations, in some cases your project or even your account could be suspended/disabled until you appeal through the email process you mentioned. For more details please check this document. As for the U.S. Digital Millennium Copyright Act (DMCA) requests, you may check this document about DMCA policy and its process hosted on Google Cloud Storage, and section 3.6 about Copyright Policy in this Google Cloud Platform terms of service document.
Furthermore, to avoid any future suspensions or flags, it is advisable to read the Google Cloud Terms of Service especially the restrictions section (3.3) at this link, and Google Cloud Platform Acceptable Use policy here. And if you are planning to make use of the Free Trial offer, please check these supplemental terms and conditions.