Yeah, but for some reason, maybe just "luck" (in the sense of "fortune"), I was always surrounded by people who google your idea and say "look at this, xyz is also doing it" which can be extremely demotivating.

That would be motivating for me. It’s validation that your idea isn’t bad. If someone is else independently thought of it, then there must be reason for it.

First-to-market is overvalued. You want others to make mistakes so you can draft behind them and take over.

Which is why it’s important that you don’t share it until you have some momentum. Then once you do just realize that many people naturally look for reasons not to put in the work, instead of the opposite. Fear of failure? Fear of wasting their time? Fear of finding out they don’t have what it takes? That it’s not all dumb luck? Who knows. Either way; just keep trucking along.