*Nobody is paying extra.
Some people are taking advantage of a discount for not wanting prebooked seats. Just like some people pay less for not having hold luggage*
^ This.
Years ago, you booked a flight and included were seats together, a meal (even on short hop), and luggage. Now elements of air travel are split up. You take your choice which bit you want and you pay for it
If you don't want seats together.. fine, don't pay for it.
If you want a meal... fine... you can buy one.
If you want to take hold baggage... fine... add that into what you are paying.
BUT do not expect the rest of us, who pick and choose and pay for the bits we want to move seats when you can't be arsed to buy seats.
I went to Spain in the decades ago and it cost me then aout £250, it was a hell of a lot of money on my wages. The price to fly taking into account inflation, has dropped 50% compared to now. But it is 'unbundled' to allow customers choice.
Sometimes I pay for where I sit, sometimes I don't. I take the risk of not sitting with my family or where I want, if I don't. I was on a flight two weeks ago... I had paid for my aisle seat back row because I needed a quick exit and at this particular airport I knew they opened front and back doors on arrival. I was asked to move to the middle of a row of 3 to accommodate someone who hadn't paid for their seat. The answer is NO.