On Tinder it would not be in the same context that what you experienced. In OKCupid it’s part of the rules that you can send messages without a match. So people are OK (I guess) with it. On Tinder it’s going to come as unexpected and unwelcome. You will start with a disadvantage. Unless the woman is only interested in money (if you can spend $500/month on an app then you are probably among the wealthier half of the population).
I loved every second of playing Undertale. I got genuinely happy for the characters and I even cried a little. Definitely a masterpiece!
Oh, it most definitely is scummy. It’s no news that Tinder does not care about people well-beings. Actually, they want you to get stuck to the platform as long as you can; if everyone was finding their partner after a week their platform would not be profitable anymore.