Autodesk is really generous with student licenses.
It's not really a matter of generosity. That is how they maintain control of their market. Without that, a lot of students would either pirate the software and/or work mainly with cheaper (or free) solutions instead.
It's true. If you can stand to "freeze" your system and stop updating the OS every year, there's actually software you can keep using more or less forever. When I was working more with printers and graphics service bureaus, they always had some old machines that ran working versions of stuff they just never updated because, well, it worked -- and by not changing stuff they didn't have to keep troubleshooting (and paying for) new combinations of software.
It only works well if you freeze every aspect of it and preferably don't expose it to external networks. You don't get security updates on such systems.