When using the Google Cloud Platform (commonly known as “GCP”), each of your applications requires a project, and each project requires an active billing account. The payment methods available for the Cloud Billing accounts depend on your currency & country. In many countries, you can set up a credit card, debit card, or bank account as a primary payment method. So, as you can see credit card is required to use GCP services.
If you want just check if Google Cloud Storage suits your needs you can create a free GCP tier account, but it will still need your payment details.
Same situation with AWS - AWS Free Tier also requires you to provide credit card info.
You can also search the Internet for a service that will provide a virtual debit card or a remote bank account.
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