Actually it doesn't permanently remove it on my model (UE40MU6400). The four Rakuten channels come back and the default app is forced back to TV Plus. Quite what causes that (e.g. firmware update, completely unplugging from power) I don't know. All I do know is that after performing the steps recommended by the Samsung helpdesk (and being assured it would not come back) it did. And my 5 and 8 years old kids saw things they shouldn't have.
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