The huge one being that your connection won't be used for illegal purposes. I would never in a million years operate what is essentially a mini Tor exit node.

And even the paid one way option ... there's also too many people on Hola sharing the same endpoints, and the threshold is high enough that many people are reporting that Hola is getting blocked as well.

The ratio needs to be 1:1. And if Netflix manages to block a user connecting from only two residential IP addresses, then the final step in this game is those two people will share their logins with each other. I connect to a Japan exit point, and use that person's Japanese account login; and vice versa. At that point, there is nothing left that Netflix can possibly do to stop me.