The parent was correct - it's not about the company not using x509 certificates, but not using publicly trusted certificates. There are myriad private/internal

The parent was correct - it's not about the company not using x509 certificates, but not using publicly trusted certificates. There are myriad private/internal PKI solutions available from OpenSSL & bash to millions of dollars of solutions from Big Vendor. If you can't replace the publicly-trusted certificate quickly, you probably don't need it to be publicly-trusted in the first place.