I agree with what others say.
You can't win with 25% of a MINiMUM viable product. That's what Minimum means less than minimum is not sufficient.
You also by confusing your customers. You need to be serving your customers and have clear communication with her. That's more important then confusing your competitors. Eventually your competitors will talk to your best customers and they will learn what people love and by that time you need to be able to compete on some other bathing suits then confusion and secrecy.
If you see a kernel of corn in the dirt, neither you nor a grizzly bear are likely to find it soappetizing you would fight over it. But tiny Bacteria and little ants will be all over it. And a couple of small birds might fight for it.
But once there is a whole ear with hundreds of kernels you and the bear may both suddenly find it worth fighting for and small birds and ants had better look elsewhere
So it is with small companies and large companies. While you serve a market so small that big players are not already in that market they will probably focus on their big markets.
But if you and your market grow together, by the time the competing bears show up you won't be a little bird any more but will now be a full size human ready to compete with bears. But probably by that time you won't compete on brawn alone (though you may use your new size to intimidate small birds), you'll compete using brains and the bears will try to use brawn.
Lastly, as others say, big companies don't usually replicate small company's work! If you are the market leader you are the most attractive Acquisition candidate.
And that is an Exit strategy which is how you get paid for building a big company over years. Do not fear that outcome.