Ah, you kindof want the opposite behaviour for protected resources. Without modifying Wayfinder or writing your own snippet, there are two ways that first came to mind:
1. 'hard-code' your anonymous link before or after your Wayfinder list, using the filter above to show if the user is not logged in:
<ul>
[[!Wayfinder .... ]]
[[+modx.user.id:isnotloggedin:show=`[[$anonymous-chunk]]`]]
</ul>
// filter syntax is probably wrong!
2. hide the link using css:
Template
// again, filter might be wrong
// not titleOfLinks property
<ul [[+modx.user.id:isloggedin:show=`class="logged-in"`]]>
[[!Wayfinder... &titleOfLinks=`alias` ]]
</ul>
RowTpl
<li><a href="[[+wf.link]]" class="[[+wf.title]]">[[+wf.linktext]]</a>[[+wf.wrapper]]</li>
CSS
// css (change to your anonymous resource alias
.logged-in .anonymous-resource-alias {
display: none;
}