Doesn't ALL free services have he same sort of clause?
I'm missing what's new compared to using... put here any the non-paid service online?
EDIT:
Here are Gmail Terms of Service[1]:
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Modifying and Terminating our Services
We are constantly changing and improving our Services. We may add or remove functionalities or features, and we may suspend or stop a Service altogether.
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What happens if they suddenly suspend their service? NOTHING! :-) we all hope and have many reasons to believe that they wont do that, anytime soon.
[1]: http://www.google.com/intl/en/policies/terms/update/