Class Action Suit over the destruction of the controller app, rendering many of the customers' products useless

I suggest you consult a lawyer before making the threat in public.  Your suggestion will be brought down to Earth very quickly. 

You refer ‘who’, exactly?  You mention ‘class action’ in the heading but not in the text — are you launching this class action  ?  If not, what are you saying here ??   This seems a fairly pointless post, and I would suggest there is nothing to see here.  

In all the years I’ve been here, through every serious and/or trivial slight foisted upon Sonos owners, for everything from network problems to the S1/S2 split and the CR100 debacle, the number of times a class action lawsuit was threatened numbers in the hundreds, if not thousands.  The number of times an actual class action suit was attempted, meaning actually filed?  Once.  And the class consisted of a single owner (He lost, by the way). 

Just dont buy sonos again and rate 1 STAR

This level of corporate malfeasance is pretty much unprecedented IMO. How can they retroactively brick products people paid for with forced updates they know are bad?

There is a strong case for a class action. I will fund the initial legal review and report back.

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This ignores the significant investment many have made in the Sonos ecosystem.  

We bought $800 soundbars and $400 speakers because they could do things that $90 soundbars and $20 speakers couldn't. But with a criminally irresponsible revamp of the app, these expensive products have become as useful as their much cheaper counterparts. 

Class action is the best route to recover losses. I am conducting a legal review.

Is that a “legal review” with an actual lawyer?  Cool.  Let us know how it goes.

Yes, with a lawyer.