Pretty much correct. It is actually quite difficult to get rid of the default to msn. Each time a new update to IE comes through one has to get rid of it again as well.
DSTV on the other hand is because one has to go to those webpages so that the dstv apps will work, and because the decoders (especially the Explora) are forever throwing up errors. The DSTV call centre bugs people, so many are now using self service to try and clear error messages before calling the call centre. Next is the EPG is quite regularly broken, so more and more persons are accessing the online guide than ever before.