> Presumably you operate in a building capable of giving you fiber, with a fixed IP, or something like that?

That is not really a rarity these days. I have symmetrical gigabit fibre with a fixed IP here in a Spanish farmhouse 45 minutes from the nearest population centre

In some countries and with some ISPs, you cannot get a fixed IP address at all, unless you register a business and prove to the ISP that you are running a business. I am guessing they will bill you accordingly then, and still have the same shoddy connectivity. I have seen shoddy connectivity with Pyür in Germany for a whole office building. Even as a business you are not immune to bad ISPs.