I did briefly consider making a "Twitch plays Tinder" back when "Twitch plays X" was a thing - before I thought about it for two seconds and realized the horrifying ethical and privacy considerations.
For men at least these apps aren't designed to get you a relationship (for young people at least) so it would be interesting to see whether it cracked the code so to speak, but golden rules are very much to be attractive and to not be unattractive.
In either of those situations, I can't see how this crosses ethical lines. It is perhaps somewhat dickish, but I don't think being an asshole is unethical.
Unless there's some third option of unethicality that I haven't considered?
Maybe I don't know the right meaning of "ethics", then.
But putting bots on dating apps is lying to people on the other side, and hurts them, in a very intimate and personal way. People put time and emotional energy considering their matches and whether to swipe etc, and the resonance of the conversation. So you're polluting that space, both with the catfishing / leading people on, or (more likely) confusing them and making them question themselves / their profile / how to relate to other humans. Is that not unethical to you? Have you talked to people who have been victims of that? My gf was actually quite afraid that I was a bot when we connected; it almost blocked our chance.