Rework retaliation text (#458)

This doesn't fundamentally change things, but there are a few subtle
differences in how this is presented.

1. It's no longer a single very long sentence.

2. The word "essential" remains attached to the text about service
   termination.  This remains a pivotal concept here.  I expect that
   reasonable people will continue to disagree with each other about
   the degree to which certain data is essential in specific cases.

3. I've included three somewhat general examples of retaliation.

Co-authored-by: Theresa O'Connor <hober0@gmail.com>

Author: martinthomson

index.html

@@ -2002,7 +2002,7 @@
 <p>
   <span class="practicelab" id="principle-minimize-consent-requests">
     An [=actor=] should avoid interrupting a [=person=]'s use of a site for
-	  consent requests when an alternative is available.
+          consent requests when an alternative is available.
   </span>
 </p>
 </div>
@@ -2093,11 +2093,24 @@
   </span>
 </div>
 
-Whenever people have the ability to cause an [=actor=] to process less of their [=data=] or to stop
-carrying out some given set of data processing that is not essential to the service, they must be
-allowed to do so without the [=actor=] retaliating, for instance by artificially removing an
-unrelated feature, by decreasing the quality of the service, or by trying to cajole, badger, or
-trick the [=person=] into opting back into the [=processing=].
+People should be free to limit the amount of private information they share,
+to request that an [=actor=] limit the uses of data already shared,
+or that [=data=] be deleted.
+When a [=person=] chooses to deny or withdraw their permission to use their [=data=],
+retaliation is inappropriate.
+
+It is not retaliation to terminate a service
+when [=data=] that is essential to the operation of a service is withheld.
+However, it might be retaliation if withholding [=data=]
+results in actions unrelated to the use of that [=data=].
+Examples of retaliatory behavior include:
+
+* making the process of withdrawing consent more onerous than granting it;
+
+* using threats, badgering, or trickery ([[?dark-patterns]])
+  to encourage people to reconsider their choice; and,
+
+* denying access to services that do not depend on use of the data.
 
 ## Support Choosing Which Information to Present {#support-choosing-info}