I believe it's possible to have an agreement with sigfox to run a base station. We have it in the office, it's a 1 Rack unti device so it doesn't take a huge amount of space and it has a pretty long range
But if someone is interested to give it a try in not-yet-covered areas in the US or elsewhere, let me know : devrelations@sigfox.com ; I could mail one for free in exchange of test feedback
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Hosting a public base station in exchange of discount/free subscriptions is something that could be considered. Again, feel free to reach out :) One thing to consider : Public base station means that other users will rely on it for their own devices, with a need for reliability (uptime, backhaul connectivity, ..)