I got GCP certified for Cloud Architect and Data Engineer in the past and it's been actually super helpful to get a rough overview what products they offer and how to connect them together to solve (hypothetical) real world problems.

I don't regret doing it, but don't see the benefit in maintaining the certificates on their renewal schedule.

The certs themselves won't help you at all, it's really the things you learn along the way. There was also a cool "Cloud Architect" sweater that I'm still wearing that they threw in :)