Some of these sites require that you submit a copy of your driver's license/identification or your work identification. Remember who you are submitting this information to, a company who sells your information for money. Keep that in mind but understand they already have it! A HIGHLY recommended piece of advice is to redact your photo (some sites such as Facebook will not allow you to edit the photo so you must use a physical object or sticker to cover it)
Certain websites require a government issued identification. You absolutely have to provide this to them for them to remove your information. Make sure the company is reputable and the method to transmit is secure (HTTPS). Do not provide your unedited DL/ID, redact information not required!