There are many reasons for doing so, the most prominent one being to avoid suffering from the unintended impacts of the ITP cookie restrictions in Safari (i.e. ITP 2.1, 2.2 and 2.3).
Our service is based on a large cloud network that continuously updates your website cookies to persistent cookies by returning them from our servers. All you need to do is to create an NS record for a subdomain for your website, point it to the Cookie Saver service and deploy our Cookie Saver scripts to your website.
Cookies are only processed by Cookie Saver; thus, Cookie Saver does not store any of your cookies.
More information can be found on our Cookie Saver website: https://cookiesaver.io/features/