With Google forms you can create your own form. Not everyone likes to give their data to Google. Also a lot of other services are from Google, so when your Google account is blocked you can not access the form results anymore. A Google account locking happened by some parents who made a medical photo of their child.
With Nostr as alternative you are using a protocol instead of a platform. You manage your account yourself by a cryptographic key. Keep your key secure well and you will always have access to your forms.