If they are legit but they couldn't collect amount that is needed to start the project they will give back your investment.
If they are scammers they can run away with your money. There's no regular law for this situation.
LOL, THis is the new way of scamming people. Actually it is already happening where the ETH invested on the project was more than 200 USD per ETH. As we all know that the ETH collected was converted to fiat currency like USD. Now, they seem to use this method seeing ETH market price goes to 100 USD so they will refund the investor in ETH they contributed. ETH now is only 100 USD which is cheap because of the downfall market trend so it is easier for the team to make the refund.