No.154417
Well... For starters, you can't really just splice into a fiber connection. You'd mess up the fiber and no data would go through anymore. Ignoring that, the data that's going over the fiber is still plain old TCP/IP and unless the hardware you plug in matches the expected hardware the ISP will talk to on its network, you're not going to have your packets route anywhere.
Same reason why you can't just plug into a telephone jack and start dialing even if you have a physical landline.
Closest thing you can do is hack satellite internet because they often have piss-poor security. I remember hearing about there being one crappy satellite internet service that would respond to all queries even if it wasn't valid and basically tack on a "throw this data away" flag to the router, so one guy hacked his and was able to get free kuso internet. A similar number of years ago there was a story about one guy who managed to hack his Starlink satellite to get free internet, but after he went public with how to do it they sent out a firmware update to correct it and blew some e-fuses or something to prevent it.
No.154435
>>154416it's easier to just get one of those satellite dish that can receive and send wifi signals and then borrow wifi from anybody around you. what you're talking about sounds like how 3rd world countries siphon power and stuff like that. the issue is you have to connect to an account instead of just a fiberglass line somewhere so you'd need to also hack the provider. if you're at that stage you don't need to care about access to the physical cables.
i feel the only way having access to the physical line would matter is if you have all sorts of intimate knowledge of service providers and even physical backdoors on their network so you're basically like the nsa.