Let's say a researcher wanted to do a study to find out what gene polymorphisms are associated with better performance on standardized tests. Nope, can't do it. Might reveal that some people, or God forbid kinds of people, are genetically less intelligent than others and that is a forbidden conclusion. Heck, this post might even get flagged because it raises the possibility that this proposition could be true.
Meanwhile, in other countries, they are offering gene modifications to insert these genes discovered by researchers doing this forbidden research into consenting adults. Anyone in the west who would want to confirm their research would get locked out of the database.