According to this: https://support.microsoft.com/en-us/office/get-started-1dd58027-40dc-42d0-9ca4-80ddecc5c696
How many responses can a form receive?
Office 365 Education
A single form can receive up to 50,000 responses.
Microsoft 365 Apps for business
U.S. Government Community Cloud (GCC), GCC High, and DoD environments
Microsoft personal account (Hotmail, Live, or Outlook.com)
A single form can receive up to 1,000 responses.
However, I send out a form and still was hit by the 200 user limit, even though I have a Microsoft 365 Personal subscription.