Much of the above mis-understands how the station retail market works.
At smaller stations, the retail unit(s) is/are either put on the market, and the highest bidder wins (like buying a house), or often it is an enterprising local who suggests something to the station operator and a deal is done.
At larger stations, the units are marketed as above, but they are carefully planned to deliver a mix of retail, otherwise you’d just end up with coffee shops as that is what has the biggest margin (there’s too many tales of ‘coffee barrow’ owners earning 6 figures for this not to be the case). So that’s why you get places like McDonalds, which will pay lower base rents, but attract people to the station where they may use other shops, or even get on a train. Having said that, the McDs at Liverpool St used to be the busiest in the country (Mon-Fri). Not sure if it still is.
And it’s a great strategy; the revenue that NRs managed stations bring in was performing well ahead of the general retail market up until Covid struck.
And whilst people may moan about high prices etc, the fact is that no one is forcing anyone to buy any of it.