If you already have started working on Fiverr, please don't do any higher budget project. You may not get your money. Fiverr has a league with the higher budget clients. This is why this website does not allow you to create a milestone for your work. Therefore, clients can go anytime, taking your complete work for free.
Although FIverr takes charges from you, they always will speak in favour of your buyer. Therefore, if any dispute comes, your client will be the winner. Fiverr will only cancel the work after taking their charges. It means Fiverr will get their charges and clients will get back the rest. Here you are the only loser.
He will be allowed to take your work without paying you a single farthing for it. Even if you send the link where your work is live, Fiverr team will take no action against your client.