Hi @Dennis_Hinze. Thanks very much for your interest but my previous answer still holds for now.
A third reason, beyond the two I already listed above, is that in the past I had a couple of different teachers reach out with similar requests and I actually did start the process of offering a bulk discount, but in both cases it didn’t go ahead since they had trouble getting it approved by the admin/bureaucracy at their institutions.
For now, I’m happy for teachers to use Readlang with their students for free, and maybe at some point some of those students may decide to upgrade. (Of course, even offering it for free can be problematic due to legal reasons, unfortunately I don’t have the legal resources to be able to comply with some of the laws that govern use of software by children in schools.)