What contract? You don't sign a contract when you create a Google account (which is basically what you need to create an API key with access to the free tier)
These terms[0] are, in general, legally binding (especially as you're a business signing them and not just a person), and it's obvious bad-faith to do this, making any sort of lawsuit hard to fight. While they most likely won't actually take you to court over this, you risk suspension of your main GCP account.
> 3.3 Restrictions.
> Customer will not, and will not allow third parties under its control to: ... (d) create multiple Applications, Accounts, or Projects to simulate or act as a single Application, Account, or Project (respectively) or otherwise access the Services in a manner intended to avoid incurring Fees or exceed usage limits or quotas;
