I’m sure this happens to someone or the other on a daily basis. You talk to someone and tell them what your startup/idea is about, only to have them respond something along the lines of “Isn’t X already doing that?”  / “ How is this different from X?” I call this the one-line deja vu dismissal: “Oh! That’s just another X”. People try to relate to what they encounter in terms of the things they’ve already seen, works like a charm generally in life and won’t get you killed but one area where it fails well is the discovery & digestion of new ideas. It’s like if you’re doing something that is even remotely familiar to what someone else is doing, you should stop. Ideas aren’t static entities. You start with an assumption, test it out; fails badly chuck it out, works okay, fix the pitfalls, rinse repeat. They mutate. By associating what I’m doing with previously known things you make life easy for yourself while ruining it for me. By painting everything in terms of what has been you entirely dismiss what can be, moving away the focus from the problem I’m trying to solve or the vision I’m working towards.
Two things may seem like each other now but it could be whole  different story tomorrow. It’s not like ideas come with a badge saying “DISRUPTION GUARANTEED OR YOUR MONEY BACK”.
And even if you are solving the same problem and building the exact same things, outcomes can vary drastically thanks to everything from luck to execution. So next time don’t ask “Isn’t X already doing this?”
Ask instead “Where are you going with this and how do you plan to get there?”