got my idea stolen

I have been working on a startup project for about two weeks now because I got admitted to a startup accelerator program after winning first place in a hackathon.

HOWEVER,

my teammate and I just learned that after a week of our hackathon presentation, a BIG company in the industry basically snatched our idea. Literal ctrl + c & ctrl + v. Even the presentation style was similar PLUS the wording that I used in the presentation.

It's pretty aggravating, but we keep on rolling I guess ¯\_(ツ)_/¯