Microsoft removed the Public Site function from SharePoint Online, using pointsite
In the previous SharePoint Online version, you can create a unique public site, and then external users can access it anonymously. This is more practical for the need to present corporate images, but for some reason, Microsoft removed this feature in May.
For customers who have used this function, Microsoft will continue to provide services for two years, but for new users, Microsoft recommends using third-party partners. For details, refer to the following two vendors: GoDaddy and Wix.com. They can create public websites.
Without a Public site, how can I share the content to anonymous users?
Microsoft provides some methods here, but they cannot enable Anonymous Access at will.
Other links:
Information about changes to the SharePoint Online Public Website feature in Office 365
Use a public website with Office 365
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