I commend Dean Dad's position on plagiarism overall. However, when he writes that "The argument about adjunct status strikes me as similarly misplaced. It mistakes compensation for the nature of the task at hand," I think he confuses compensation, or how much the adjunct gets paid, with the adjunct's disposability. In my experience, the only currency an adjunct instructor has is in how seldom his or her students complain to administrators. Great teachers who generate complaints do not last, and even adjuncts with low student survey numbers are retained unless they generate face-to-face complaints which eat up administrators' time.
It's not about the money, but in how quickly and easily adjuncts can be fired, or not offered new sections next term. Smart adjuncts who want to continue working learn to overlook plagiarism or don't search too hard, and those who respect themselves institute what Dean Dad calls "frontier justice," or dealing with each plagiarism case separate from administrative processes.
Regarding plagiarism, adjunctification has resulted in a weakening of academic rigor. You can't casualize a class of workers without lowering the respect they earn from the public. In higher education today, "retention" is more important than "standards."