I've tried. Their line is connected to the same exchange as my ADSL and via BT who are tasked to upgrade UKs domestic to fibre by the end of 2026.

I have even asked if I provided the equipment run a Line-of-Sight links from the hotel to my apartment. Perfect range and advantage point but nothing other than some PR fluff of "it may harm the public".

No, a hotel manager isn’t going to want your antenna on their roof. From their perspective it’s unnecessary and weird and therefore out of the question.

BT sells internet service, transit, and buried cables. You want to do what the hotel did and buy a buried cable from them, and then buy transit. You’ll need to do like the guy in the video did and rent some space in their colocation facility to put your gateway in. Plug your buried cable into your gateway, plug your gateway into their router, turn on BGP, etc.

They also offer an intermediate service called a “leased line” which is a buried cable plus transit plus they handle all of the networking for you as if you were a consumer. The hotel chain might have gone that route as well, although there are clear advantages to having your own AS. You can figure out exactly what they did if you connect to their guest WiFi and run `traceroute -A`…

Of course your apartment manager (or the owner) might not agree to let you bury your cable on their property. They might even have an exclusivity agreement with the cable company. This could even be the reason why no other ISP is available in your apartment building.