This is of course not including the yearly Unity subscription, where Unity Pro costs $2,040 per seat (although they may have Enterprise pricing)
Absolutely ridiculous. Many Unity devs are saying they're switching engines on social media.
EA has been doing this for years. Except they were nearly infinitesimally nicer about it and gave you X installs per key, with the caveat that you had to burn hours on their support line to get it reset.