Draft pro info

app/src/main/res/layout/fragment_pro.xml

@@ -39,6 +39,16 @@
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/tvPending" />
 
+            <TextView
+                android:id="@+id/tvInfo"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="12dp"
+                android:text="@string/title_pro_info"
+                android:textAppearance="@style/TextAppearance.AppCompat.Small"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toBottomOf="@id/tvActivated" />
+
             <TextView
                 android:id="@+id/tvList"
                 android:layout_width="wrap_content"
@@ -48,7 +58,7 @@
                 android:textAppearance="@style/TextAppearance.AppCompat.Small"
                 android:textColor="?attr/colorAccent"
                 app:layout_constraintStart_toStartOf="parent"
-                app:layout_constraintTop_toBottomOf="@id/tvActivated" />
+                app:layout_constraintTop_toBottomOf="@id/tvInfo" />
 
             <Button
                 android:id="@+id/btnPurchase"

app/src/main/res/values/strings.xml

@@ -807,6 +807,11 @@
     <string name="title_pro_list">List of pro features</string>
     <string name="title_pro_purchase">Buy</string>
     <string name="title_pro_once">Only once</string>
+    <string name="title_pro_info" translatable="false">
+        Developing FairEmail took literally thousands of hours and despite that most features are free to use.
+        To make FairEmail sustainable in the long term, some convenience and advanced features are not free to use.
+        FairEmail displays a small banner to remind you of this, which will be removed if you purchase the pro features.
+    </string>
     <string name="title_pro_hint">Buying pro features will allow you to use all current and future pro features, will keep this app maintained, and supported</string>
     <string name="title_pro_price">Please see <a href="https://github.com/M66B/FairEmail/blob/master/FAQ.md#user-content-faq19">this FAQ</a> about the price of the pro features</string>
     <string name="title_pro_pending">Purchase pending</string>