Anyone can build a feature you can. Some market segments have existing players and people shouldn't be afraid to play competitively. You don't live in a bubble and you can innovate all day but your customers are still the same people with the same needs. Either you are solving them, in which case someone else will too. Or you are trying to sell them your toy project and convince them they have a problem that it solves. SV has burned through billions on projects that were hyper niche or had no market at all.
You can make a moat around your product, but that is different. You still have a core value proposition that solves their real world problem and there will be other people solving it too.
Most companies build moats through contractual lock in, trust and size, or simply buying their competitors. I have yet to see a feature only moat.
