LOL, companies get hit with frivolous lawsuits all the time. What do you think the outcome will be from those 30? You really think Apple will be refunding the cost of phones for people who bought new ones or refunding the total cost of the throttled phone?
The right/wrong is gray here, despite how black and white you think it is.
Apple is legally covered to implement software to manage power on their phones and you agree to it in terms and conditions. Trying to understand what Apple knew, their intent, etc is a lot more difficult than you think.
Personally, I believe Apple tried to deal with an issue on a limited amount of phones and potentially miscalculated how much of an effect it would have on a larger scale. Perhaps some of the batteries were bad from the factory or the software was too aggressive in its management. I don't think trying to avoid shutdowns is a bad thing and I know Apple isn't the only company with degraded lithium batteries causing unexpected shutdowns. Just Google Android boot loop or Android shut downs.
Apple doesn't guarantee any level of performance. They are offering you a $29 fix on up to a 3.5 year old device. Pretty cool.