So, where does all this leave MoviePass subscribers, some of whom are being charged on a month-to-month basis, while others are locked into annual subscriptions that required an upfront payment? CNBC Make It asked Omri Ben-Shahar, a professor at the University of Chicago Law School who specializes in contract law and consumer protection some of the questions on MoviePass users' minds.

What can you do about all those changes MoviePass keeps springing on users, like higher prices and blackouts?

MoviePass's latest price change (to take effect within 30 days, according to the company) and blackouts (some new release movies will have limited availability during their first two weeks in theaters) are just the latest in a string of tweaks the company has made to the terms and conditions of its subscription plan, which some customers have deemed a "bait and switch." In recent months, MoviePass also suddenly announced changes such as the introduction of "peak pricing," where users have to pay an additional fee to book tickets to certain high-demand movies, or only allowing subscribers to see each movie once.

The MoviePass terms of service are somewhat vague with regard to service outages or movie blackouts. But the contract does note that future subscription plans may include premium or "capped plans" that could limit the movies a user sees per month, and the terms also include a disclaimer notifying users that MoviePass "does not promise that the site or any content, service or feature of the site or service will be error-free or uninterrupted, or that your use of the service or site will provide specific results."

Ben-Shahar, who looked over MoviePass' latest terms of service, found that the company says it essentially has the right to change or modify its service at any time in its sole discretion, including prices "without prior notice." The law professor notes that just because that language is in the contract, that doesn't mean MoviePass can simply change the nature of its service dramatically, or without limit — courts often side against companies that change the terms of a deal without properly notifying customers or giving them a reasonable opportunity to drop their subscription.

"There needs to be some ability for consumers to either reject that proposed change or to terminate the service without undue burden or any cost," Ben-Shahar says.

Read more at CNBC