I think you should habe a valid claim, if you buy a new device you still have warranty and to have a device disabled during warranty preiod is unprecedented.
Your beef would be with the retailer, not with Google. It is the retailer who makes the implied warranty of suitability for purpose, not the manufacturer (who also, in this case, is not Google).
That's not accurate, at least in the United States. Product warranties are issued by manufacturers, and Google's pages for TP-Link[1] and Asus[2] confirm this.
The manufacturer warranty is 2 years for both the TP-Link[3] and Asus[4] OnHub models.
If there were a class action, it would be against TP-Link and Asus. These manufacturers would then take the losses into consideration before collaborating with Google in the future.