why should the ISP have a monopoly on using fiber cabling ?
the same OM2 fiber cable type they use can be used with datacenter/home networking equipment, except usually telecom equipment and cables use APC connectors (green color) instead of UPC connectors (blue color).
these connector types are physically incompatible and you should never stick a green plug into a blue outlet or vice versa, this results in physical damage (APC is smaller and angled, this will scratch up the flat UPC).
however, if youre running new cable, nothing is stopping you from running LC/UPC duplex cable into the walls, and then using that along with 10$ transciever and 35$ SFP+ network card in a computer, with the other end of the cable connected to another 10$ transciever in a SFP+ port on a switch, to give you 10gbps cheaper than through cat6 (the transceivers/ports on switches for that are 50-70$). of course the switch will also have some standard 1gbps ports for you to connect your tv or console, as they wont need to access a NAS at faster speeds than that (you can even get a 1gbps fiber transciever for the switch end, and a 1gbps fiber to 1gbps rj45 converter on the other, for your tv/console, if you want 0 copper going through your walls).
btw, E/G/X/PON SFP+ MAC modules exist, allowing you to plug in the incoming cable from your ISP into a SFP switch, and thus bypass their router, and keep everything flowing through your SFP+ switches/routers, without going through the ISP supplied router and a 1gbps ethernet cable.