This week, I got emails announcing changes to two online services I subscribe to. I just sort of shrugged at one message, though it did represent a significant change in the service's business model. The second email outlined a major change as well, but my reaction to it was much stronger. It ticked me off. The first message was from Groupon, informing me of changes to its Privacy and Terms of Use policies. The second one was from Netflix, telling me it was revamping its pricing plans.