The definition of words can change, but you’ve made me notice: there’s something more insidious and dishonest potentially going on here.

“Name is definition” is not just making a linguistic association, which, as you say, can change across time and community.

It’s also saying, “when you heard name before, what the speaker meant was definition.” Which, in this case, can be a lie. That’s abuse of teaching authority.

Now that’s not the whole of it, and you have a point. Just you made me notice this aspect now.

Chiming in with those who want to keep the specific meaning of wage theft, to better address that already-egregious problem, how about a new name for this.

Value theft. Or, Profit theft.