That's not accurate. The article is about Australia. Netflix Australia had a net loss of 200K subscribers specifically due to the anti-consumer moves they've made which affects a lot more than just sharing a password with a family member. That's a 3% decline in a major country. Meanwhile, Netflix rivals had subscriptions increase overall and several saw huge surges. Netflix remains #1 by total subscribers in Australia, but that shouldn't shock anyone given the inherit momentum they possess.
The article was never about Netflix globally. It was always about Australia. Companies operate business units in regions, and each region must perform.
I agree, and those routers can be extremely cheap. I recommend people plug them directly into ethernet whenever possible otherwise speeds basically get cut in half when operating as extenders (just like at home, excepting backhaul).
And in hotels without an obvious ethernet port: check behind the TV. There is usually a less metered port on the wall back there for use by the TV. Sometimes it is restricted, but I've been pleased to find that enough hotels don't have the foresight to do more than simply obscure things a bit.