There is no such thing as "unlimited" internet of any kind.  It is a mathematical impossibility - like "zero bandwidth transmitter".   Fiber has a high rate to the home, but you connect to the same routers and switches at the ISP office as when you have cable.  I actually prefer cable (unless your application truly requires Gbit or more over the internet) because fiber has a higher cost to install, longer MTTR (takes longer to repair), and shorter MTTF (fails more often).  

What is called "unlimited" means "unmetered" - you are charged a flat rate.  This causes many perverse incentives for both ISP and customer, which I won't go into here.  (Similar to an all-you-can-eat restaurant - which is never truly all you can eat and also has perverse incentives on both sides.)  The economic incentives are much saner when paying for actual bandwidth consumed.  A compromise is "tiered" plans, where you pay a flat rate for each capped tier, with an option to auto upgrade (if slowing down services is not an option). 

 sure.  There is no such thing as unlimited air either lol 

 You don't pay for air.  Yet.  (See "carbon" taxes.) 

 We pay for everything, whether one sees it or not.