You're more than welcome to get an Amateur Radio license and get the same access to spectrum, in some cases spectrum that's even better than what cellphones run on now.
Yes although you might not get caught if you were careful and quiet.
You’re aloud to sign things, so if you’re doing ip/packet you can use client side certs for authentication and then I think with OpenSSL there’s a way to only enable the “null” cypher.
The other issue is you’re not supposed to use it for profit (except selling radio equipment and I think there are other rules on that too) so you really couldn’t usefully replace your internet connection with it.
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