[mynameisvlad]

Sure, which PayPal used:

> If we believe that you’ve engaged in any of these activities, we may take a number of actions to protect PayPal, its customers and others at any time in our sole discretion. The actions we may take include, but are not limited to, the following:

> Terminating this user agreement, limiting your PayPal account (and any linked Balance Account), and/or closing or suspending your PayPal account (and any linked Balance Account), immediately and without penalty to us;

[RunSet]

I just bet the PayPal terms also included words to the effect of "We can alter this deal, already couched in the vaguest possible terms, whenever we please without any notice other than this."

[mynameisvlad]

Those are among the first actually.

Fun fact is they disclose them differently for personal and business accounts.