[user8139471]

As a TA, I can tell you that there is no form of assignment that can not be cheated on. For example, essays and papers will usually contain sections copied straight from literature or from other students.

Another common proposal is to give individual assignments to each student, but it is usually impossible to make equally difficult assignments, so this approach is not very fair. It also does not work when students are paying other people to do the assignments for them, which has become a huge problem over the last few years with the commercialization of cheating through various platforms.