I see your point Vince. Unfortunately, solo passengers are often encountering restrictions. And there is always a financial argument behind it. But even if it is not new, this does not make it fair. No need to repeat the arguments behind.
Now, since I travel solo many times, I see new developments for solos which are really hard to accept. For example in Spain several restaurants, specially on those touristic places like Barcelona, are not accepting solo guests anymore. I belong to another forum of solo travelers in which they are telling their experiences of being refused to be served because a solo is occupying a table which could be given to two people. This is affecting not only travelers but solo locals as well.
Now in Europe this is discrimination. It falls under European laws and it should not happen. But restaurants are avoiding to be demanded just pretending to be fully booked if a solo wants to dine there. The restaurants are empty but solos are refused service 😔. I will be in Barcelona next year at the end of a cruise. We will see what I encounter.
This only happened once to me In Beijing about 35 years ago, when I went on my own to China. China was still not very open to the west and tourists were few. I wanted to eat a Peking duck, and the restaurant refused to serve me saying this was a meal for at least 4 people. I have said no problem, you bring me for 4 people 🤭. It was most enjoyable and the friendly Chinese personal of course later on prepared a bag for me to take to my hotel.
Ivi