There is a ToS in-game when you register for an account or such. I remember just going through one when I newly got PL on my iPad. So I think it links to each device and not each account.
And "advertising" other apps in others is just common sense. Firstly its unethical and common courtesy not to. Relate it to real life, you've got your own shop and another person comes into your shop and advertises theirs?
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