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Let's get one thing straight: just because you're giving a vtuber money, it doesn't entitle you to any kind of fanservice or give you any sort of agency over what they do on stream or in their personal lives.
This is the case for vtubers, streamers, and really any kind of content creators. Your superchat is an indication of your support for their content, nothing else. You don't get to send $100 and say "please play this game," or "please don't do activity x with person y anymore" or "Please stream on x day." That's not how it works. They don't owe you anything.