The cost of termination is so high and specialized, for the most buildings they even use pre-terminated cables for your fiber patchpanels in the rack. Cat7 is more expensive than Cat5 here, but not by such a big extent. And, thats one of the biggest points, its easier to get as for example Cat6.
If you keep in mind that it’s only done with special certified subcontractors, then yes. I would never give that information directly to a company like X. And yes, also those special companies are more times shady than they should be, but still.