Can you explain why the following is in the T&Cs of the ICO? I want to invest, however, this is saying I cannot, if I am a resident, domiciled, or even located at time of purchase, in the US.

"
12. Purchaser Representations and Warranties
By sending ETH to purchase Tokens from the Company, you represent and warrant
and covenant that:
.
.
.
(k) you are not resident or domiciled in the United States of America or purchasing Tokens
from a location in the United States of America;
"

Thanks in advanced for your feedback.