Join the Public Suffix List
TXT _psl.sslip.io record attests ownership for the Public Suffix List
We want to place sslip.io on the Public Suffix List so we don't need to pester Let's Encrypt for rate limit increases.
According to https://publicsuffix.org/submit/:
owners of privately-registered domains who themselves issue subdomains to mutually-untrusting parties may wish to be added to the PRIVATE section of the list.
References: