Shady as in not clearly communicated and change with random tweets being the only indicator, or a blog post if you're lucky.

x20? 25x? 5x? All in comparison to some other plan that also doesn't have clear limits. "Oh BTW we mean session limits, your weekly is 2x of 5x". "This model eats your limits twice as fast and you can use half of your weekly limits on it". "No this time we mean weekly only".