You can always simply use ansible-galaxy collection install google.cloud to install the collection if you use the ansible community package. If you don’t use the ansible community package, you have to explicitly install collections anyway, so in that case there should be no difference.
Is nobody else using GCP with Ansible?
People are, but google.cloud doesn’t seem to be a good collection for GCP users, see for example Community version of google.cloud.
Also the collection has a history of being unmaintained for some time, see What should be done for the sorry state of the google.cloud collection? and the resulting discussion/vote [Vote ended on 2023-02-14] Unmaintained collection: `google.cloud` · Issue #105 · ansible-community/community-topics · GitHub; in the last discussion you will find that the collection was once scheduled for removal, but that removal was cancelled (Re-add google.cloud to Ansible 8 by mariolenz · Pull Request #201 · ansible-community/ansible-build-data · GitHub) later since the collection was maintained again.
Generally it is also possible to cancel the scheduled removal again (see Ansible Community Package Collections Removal Process — Ansible Community Documentation for the process - I guess it’s missing step 0 “Someone needs to request that it gets re-added” though).