You're misrepresenting the point.
If a company goes "This is our service and this is what is included in our service charge" and then starts taking items out of that package for no reason than to charge separately for them you can be sure there will be consumer blowback.
In fact its the exact reason that when cable, internet, and phone providers update their packages for new subscribers they dont go back and ninja the customers on existing plans, they keep them as they were for previous subscribers, because thats what they signed up for (also contracts but y'know).
So can they decide to charge for it? Sure, they can.
Most companies however deem the practice unethical (lol they don't want to deal with the blowback) so they don't do it and consumers have the right to voice an opinion if they disagree with the service.
Except that it costs them nothing on the development end to re-issue annual event items, I'm not talking about events that were deemed exclusive like the "Lightning Returns", Dragon Quest, or Yokai Watch crossovers.
Allowing players to re-obtain seasonal event items in-game was something this game allowed before the Mogstation, it was a feature of the game one could count under what their subscription covered. Then when the next year came around suddenly the vendors no longer provided those items and you could "look forward" to them being charged for an additional fee on the Mogstation.
You're once again misrepresenting the point, either that or you simply don't understand it (which is okay).
The argument isn't "I dont want to pay for this!"
The argument is "Why am I suddenly paying an additional fee for something I didn't have to before?"
Am i required to buy items off of the Mogstation? of course not, hence why i don't.
But if I'm paying a monthly fee for something and over time have been led to expect certain things where included under the umbrella of that monthly fee, as a consumer it is within my right to disagree or voice an opinionm if the company wants to remove some of those items and charge me additionally for them instead.
You're saying "well speak with your wallet" but i dont play the game for the items on the mogstation so outside of not buying them already (which i dont) unsubbing wont really say anything.