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PHP 7.3 reaches end of support in December 2021 and Adobe Commerce 2.3.x reaches end of support in April 2022. You may want to consider planning your upgrade now to Adobe Commerce 2.4.x and PHP 7.4.x to help maintain PCI compliance.

WebapiSecurity

WebapiSecurity enables access management of some Web API resources. If checkbox is enabled in backend through: Stores -> Configuration -> Services -> Magento Web API -> Web Api Security then the security of all of the services outlined in app/code/Magento/WebapiSecurity/etc/di.xml would be loosened. You may modify this list to customize which services should follow this behavior. By loosening the security, these services would allow access anonymously (by anyone).