I don't mean this to belittle you but good ideas are a dime-a-dozen. As a person who both has good ideas and knows how to code I can tell you, form experience, executing a good idea is extremely hard. I'm not just talking about the code. The code is the second easiest part. The one where almost everyone trips up is business development and marketing.

Finding a coder who can solve the bizdev rubicks cube is as rare as a bizdev guy who can build an MVP on his/her own.

TL;DR no freelance coder is going to be able to execute both the code and the business plan, so don't worry. If they were that good, they'd already be rich and wouldn't be soliciting freelance gigs.