Honestly, I get that some people really hate or really love certain fetishes, but you're 1 million percent correct. Why keep playing something you don't love? Why even feel the need to announce "I'm out" on here? Just go to the next game and delete this one if they hate it so much.
I don't expect others to see things the way I do, so I can only speak from my own perspective. Some of us love both sub and dom content. Even if the virus weren't affecting things and shifting behaviors, in Melissa's case I look at their relationship more like, "What game are we gonna play tonight, babe?" You had a couple days in a row of domination, so being submissive for a while is only fair to her.
What's more, though, if she's naturally dominant, shouldn't logic dictate that she'll still be dominant in general even if she's submitted for a bit? You don't have an entire life of personality development completely ditched in just a day or two. The virus makes Melissa going submissive plausible, but unless it permanently altered her entire personality, it's actually unrealistic for her to stay sub to the MC. It just isn't who she is, not really.
Again, obviously others don't need to agree with me, but constantly whinging over it isn't going to change it. Either accept it or move on. And, ofc, ultimately it's your game and only your patrons' decisions should have any effect on your own.