> 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
Most of those business connections come with actual SLAs though that you don't have.
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.