This message (SRF Play via Hbb TV) normally only appears when you switch on the channel, after which the message should disappear again by itself, and then no more.
Apparently this is not the case for you, but this is not normal. Try restarting the TV Box. You may also need to disconnect the TV Box from the power supply for 30 seconds.
If you can do without Hbb TV completely and prefer to watch this content via app (installation via Google Play), you can also deactivate it.
To do this, go to Settings -> TV and Radio -> Interactive TV, uncheck HbbTV enabled and save.