But as any business venture: if you don't know whether you can get the customers, you better have the cash lying around to pay for everything yourself =D
Starlink is a replacement for dial-up, satellite, and in some cases legacy DSL- pretty much nothing else.
You can push gigabit[1] ptp over the air these days for pretty cheap. Starlink seems to top out around 200Mbps in the best case.
[1] https://store.ui.com/us/en/collections/uisp-wireless-airfibe...
https://ca.store.ui.com/ca/en/pro/category/all-60ghz-wireles...
If you can get a fast wired connection, do it. Starlink is for people who can't, and it's far and away the best option for them.
The target audience for Starlink in the continental US seems to be people who's other options are traditional satellite, dial-up, or sometimes DSL (typically implying you're in a more rural area, but not always). For people in those situations, Starlink can be a good alternative.
However, if you have access to modern cable or FTTH... well, it's not a substitute.
That's not too bad. However, there's no speed listed. Third party reviews state 100/10 Mbps (up/down), which is not too bad considering the same site states a UK average of 75/15.
The vast majority of the UK has pretty slow speeds.
That said, unlimited internet subscriptions over fiber can be had for as little as 20 USD per month, which is far cheaper.
The only credible options are WISP, Starlink, and cellular. WISP is the same price as Starlink and is slower / less reliable. Cellular is cheaper but gets slow at peak hours.
In short, the local WISP has been losing a lot of customers to Starlink and T-Mobile Home Internet.
I lived in a village in Colombia, population about 2000, which had four competing wireless ISPs. The quality was extremely low, but so were the prices.
For now they're having to launch a Falcon 9 twice a week to build up the constellation, but with Starship intended to be able to launch the equivalent of several F9 launches in one go, maintaining the constellation will become much easier.