This makes me curious: Do you have a specific goal in mind?
The value in exiting providers is their reach; versign for example is deployed in practically every trusted root bundle. When GoDaddy wanted to enter the market, they bought Starfield who already had a root which was widely trusted and crossed that with their own.
The reason people will pay for you to compute a number based on a number they give you and your super secret number is that people trust what you’re doing with your super secret number. And that trust takes time.