It's illegal in many countries to advertise for investments like this.

So for example in the USA: https://www.law.cornell.edu/cfr/text/17/230.502

You can't advertise, in fact much of this 'kickstarter for investment' would be virtually blank by law. You would have to pre-screen and qualify each investor on your own. Nobody would be interested in investing this way.

Very long history on why this is important and why virtually all countries with an exchange do this.

Want to pivot your idea? Create "uber plumber' or 'uber electrician' or 'uber handyman' where you can basically request an electrician and electricians can join up and get jobs easily like an uber eats.