Yeah, that'd work too. Although assuming you're not supposed to share your account with another household, I'm not sure what the rationale would be for allowing one of your out-of-home devices be a TV-connected device. OK, yes, it is nice if you travel a lot to be able to connect your Roku to the TV in the hotel/AirB&B so that all your content is there with you on the big screen, as opposed to watching on your laptop/tablet/phone or settling for whatever they have on their TV.The other way they can do it is to tie it to a device for outside the house streaming. So perhaps you can tie it to only 2 cell phones at a time or a cell phone and a streaming device. I'm sure people who want to will figure out ways to get around that, but the casual user who wants to let their family and friends use their account won't bother.
But this also seems like an edge-case. And I'm sure those streaming services would like to sell subscriptions to those hotels so that those establishments can offer that content via their in-room TVs to all guests (the same way every hotel and motel in the USA would advertise "free HBO" or "free Showtime" starting back in the 70s or 80s).