Why are you comparing coding up dark pattern feature to the malpractice? It's more comparable to, e.g. a patent troll's lawyer drafting a letter intended to bully a troll's victim into paying out of fear of litigation costs. Or reviewing a forcing arbitration agreement that a company intends to make all its employees to sign. Or other things that can be considered morally 'evil' but completely legal and wont get anyone sued for malpractice.