Question: My web host wants my social security number. They tell me they want to pull my credit report before approving my account?
Answer: Any web host that asks for your social security number is not a typical web host. 99% of anyone that runs a web hosting business would say the web host you mention is a really suspicious if not outright SCAM.
You should not have to provide your social security number to a web host so that you can open an account with them. If any web host asks for your social security number for any reason at all then you should IMMEDIATELY end any and all relations with them.
Your web host does not need to know your social security number for any reason. Your web host also does not need to know your credit score or view your credit report for any reason.