From there, tableau becomes a "learn it just to get hired at a company that might use it" tactic, which is a valid job hunting strategy but is not something useful to learn in a data viz class, especially since there are other data viz tools the students can learn and keep using after graduation.
That said, I don't see why any student couldn't continue using the free Public version.
Judging by the sparsity of the public dashboards seemingly no one is using the free version.
As bduerst said, learning Tableau is only useful if your employer will be paying for it.
So I briefly cover Power BI and concentrate on Python.
I'd rather spend more time on various visualization methods in Python.