the worker rights issue is mostly a concern for blue collar workers that are forced to become freelance by some companies to save on welfare costs. that is what tax authorities actually look for when they talk about "false self-employment" and that is why it is the company giving the assignment that gets punished in these situations and usually not the freelancer.

that's not really a concern for high billing consulting professionals. it is a common misunderstanding (as you can see from comments here) though and is variously used by companies to undercompensate people who could be far more profitable consulting