In formlab's case they had a 1.8MUSD seed round prior to the crowdfunding. They raised ~3MUSD from crowdfunding. This probably helped give them some runway to

In formlab's case they had a 1.8MUSD seed round prior to the crowdfunding. They raised ~3MUSD from crowdfunding. This probably helped give them some runway to put together a series A. However they still raised an additional 50MUSD. So, I don't think they're a great example of a company bootstrapping from crowdfunding. It's more of a traditional play, with some validation (and some runway) from crowdfunding.