You can use PowerShell to configure a customized per-site Anyone sharing link period for different sites. Public sites might have a 365 day period while more confidential sites might have a more restricted period. All it takes is the Set-SPOSite cmdlet to set the necessary properties and you have a customized policy.
https://office365itpros.com/2019/11/27/configure-per-site-anyone-link-expiration-policy-sharepoint-o...
