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That's one solution. I don't think it's ideal. Not everyone would know to tick that box. I would, but my friends would not and their networks would be vulnerable.

It could also require buying new hardware. Once again, I would know to look for a Wi-Fi Sense-proof router, but my friends would not.

I also don't think we should be expected to solve problems that Microsoft caused. Why should the industry adapt to Windows rather than the other way around?

That's the only part that seems kind of cool. It's legally a bit strange, but terms of use on public Wi-Fi can be really annoying, especially when they don't work well. I've had networks refuse to let me on because their terms of use thing is broken.

It isn't as though anyone actually reads the terms of use anyway.

I don't believe it can go multiple "hops." If you connect it goes to your friends, but it does not go to friends of your friends.

If your friends connect to the network using Wi-Fi Sense, it might spread to their friends. I'm not sure.

"using this system from the start"

I don't use Windows, so I cannot use this system at all.

"add you neighbor on Facebook and get free access to their WiFi"

That's missing the much bigger downside. Give your neighbor your Wi-Fi password and they can share it with hundreds of their friends automatically.

Microsoft claims users will not be able to find the password and that users will only be able to access the Internet, but that assumes there are no security holes. I'm not comfortable putting my network security in the hands of a company I did not choose to associate with.

That's true but kind of misses the point. I'm not worried about my machine using this. Hell, I don't even use Windows. I'm worried about the zillions of people who do use Windows and who will thoughtlessly enable this because it seems convenient. They will wreck the security of other people who have done nothing wrong.