In most cases, it will be because we have been advised or believe that you do not offer such a service.
If you have never made yourself 'Available Now' or logged into JustCamIt, then, of course, you are not actively looking for this kind of work or offering this service. No one is going to book you if you are not showing as available or never log in to the cam broadcasting software.
There is no problem having a Private Gallery and/or Movie Library and not offering any other service, but advertising as a Webcammer or Phone Chat provider when you are not actually actively taking bookings or looking for that kind of work is not permitted.
You may attempt to add yourself back into this category via your Registration Details page but you will be removed if you do not actively participate in such activity.