Bitcoin investors do exist; however, the attitude should not be that different from "fiat investors" if we talk about real corporations. For example, Roger Ver --I know that he brings so much negativity and his behavior is so unethical after BCH, but I need to mention him for the sake of this argument-- is one of the first people who built businesses from bitcoin and invested in many bitcoin-based businesses.

It would be best if you have a good business plan, MVP, and a legal entity from the beginning. If you do not have that, consider using the bootstrap method. https://www.investopedia.com/terms/b/bootstrap.asp
I do not recommend using crowdfunding or ICO since you might have a legal problem in the future.

If all go as planned, you can be more comfortable to attract investors in some blockchain event.