Theoretically, there is nothing wrong with this practice. It can help to reduce the feeling of fossilization that creeps in after a lesson has been done several times, for example. We all know that feeling. The other side of the coin is also something worth considering though, and that is consistency.
Branding, like it or not, is here to stay. The Connect brand is distinct. To remain so, teachers should entice students to explore other options from the Internet. No one is stopping them from finding sources on their own time to study as they wish. We should, in fact, encourage students to do so as it helps develop search skills, which is something we take for granted, but shouldn't because students often find it difficult and daunting.
Activities carried out in class should always stem from our own materials. The idea being that group work and sharing is paramount. This is how our materials have been set up. Taking an activity from the Internet forces the teacher/TV to be centre stage, centralizing the classroom once again in an old fashioned way instead of making the students themselves the centre of attention.