Exactly. The reason that I brought this here was to highlight this incredible lack of protection with source files. This is not a risk that any freelancer should be taking ever. Completely giving over your work with only the hope that the buyer will be honest is just crazy. I don't know who buyers are or what they're like so my work needs to be protected. I came here to warn sellers and hopefully so people can brings this to Fiverr also.
It's a massive oversight in security and intellectual property. Fiverr does not require any real info from buyers which means if they did steal your work, there would be almost no way to prove it.
The solution would be pretty simple too. Just do not allow for source files to be downloaded until after the order is completed. If there were any issues at that point it would be far easier for the buyer to prove that the seller has not provided the correct file than it would be for the seller to prove that the buyer has downloaded and used their work.