Sentry - shop input computer/laptop onely

I just did a shop for Sentry and in the guidelines it states that you can input on a desktop or laptop not a mobile device. I was wondering two things.

1. How do they know we are using a mobile device?
2. Why would they want desktop or laptop only?

Does anyone know the answers?

Thanks in advance.

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Some Websites can detect in general what kind of device you are using (desktop, laptop, mobile). Programs/platforms are written to a specific platform (desktop, tablet, cell) and may work on desktop but may not work on cell, etc.
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