Theres really no eli5, this is a purposely convoluted topic

Best I could offer you is recomemend you go look up the channels Lehto's Law and The Institute for Justice on YouTube

In the US, easements have a history of being abused to render large areas of privately owned land useless/unusable, to legally trespass, and to harass landowners

There's a reason for example that American Tribes fight especially hard to prevent easements from oil or rail or really any companies

Cable companies in particular have a reputation of destroying peoples properties, have numerous times now been given insane payouts to build the very infrastructure with taxes that they just bought and in those instances pocketed the money without even a slap on the wrist. Further their involvement indicates that any further infrastructure projects expanding that fiber are basically dead, and for any that exist they're going to be on life support

Those same bailout companies just got their hands on the easements that were allowed to go to a group who at the least didn't have that history of abuse, and precedent of the that deal going through so it is more likely to start happening in more places

All of those easements should be considered as dead space and new ones will have to be allocated when expansion is taken up by yet another company on 10 or 20 years when they prove they won't upgrade or properly maintain theirs to modern needs, that means further encroaching on people's property

Think of it like sidewalks that moved another 3-4 feet into people's yards every 10 or so years which you as a homeowner are not allowed to alter or use or complain when their representatives do so