The announcement (https://ionq.com/news/june-17-2021-ionq-quantum-computers-now-available-on-google-cloud/) makes it quite clear:
IonQ’s systems will be the first third-party quantum computers purchasable via the Google Cloud Marketplace
Developers, researchers, and enterprises alike will be able to access IonQ’s platform with just a few clicks; billing and provisioning will be handled via their existing Google Cloud accounts.
“We’re thrilled to make our hardware available for purchase on the Google Cloud Marketplace, and we can’t wait to see the different workloads that developers start running,”
So to answer, no you won't be able to access these chips for free, except if someone else is paying for you (like a company or a research laboratory).