https://techcrunch.com/2022/02/03/google-workspace-goes-all-in-on-shadow-it/

Google today announced a new version of Workspace, the company’s productivity service that you probably still refer to as G Suite. With the new — and free — Google Workspace Essentials plan, Google wants to bring more business users onto the platform by offering them the basic Workspace productivity tools — with the exception of Gmail.

Until now, in order to use Workspace with a non-Google email address, you had to sign up for the $6/month/user Business Starter account after a 14-day trial.  That paid plan is not going away, but all you now need to do is sign up with your work email and you’re good to go. No credit card needed.