Given that it costs 168 rubles, I don't think it's a problem for anyone. For those who have been playing for a long time, it can be paid as a thank you to the organizers, even without playing this month. Everyone sensible has been playing with the expansion pack for a long time, not stuck in the past. And finally, if there are still tournaments where people without the expansion pack are allowed to participate, I think it's worth letting such people stew in their own juice, let them enjoy their principled stance with each other. And just not register for such tournaments.
However, judging by the fact that the person only regularly plays SOD and doesn't have a subscription, there's some kind of personal principled stance here (for example, like one well-known clinical case). I definitely don't approve of this.