So why don't they just block those accounts? If they're all authenticating centrally for access to these servers and I assume lots of accounts per server, they

So why don't they just block those accounts? If they're all authenticating centrally for access to these servers and I assume lots of accounts per server, they could just stick a fair client limit on accounts (eg limit the number of new clients from multiple IPs, existing clients could roam networks without limit). What they're proposing seems like a very shortsighted grasp for the cheapest solution, ignoring the fact that many paid users are looking at Jellyfish et al.