Angular / Dart and Material Inputs: How to put a link into a checkbox label?
HTML in string interpolation bindings is not supported.The label attribute is added using string interpolation
<div class="content"> {{label}} <ng-content></ng-content></div>material-checkbox template source
As you see in the template, projected context is supported though, therefore this should do what you want:
<material-checkbox [(ngModel)]="agbsAccepted"> I have read <a href="/#/terms" target="_blank">the terms and conditions</a> and accept those.</material-checkbox>