So first Sonos, and now Logitech, effectively bricking devices to discourage and impede a second hand market for their products.

Not only is it anti-consumer, it's ecologically unsound, preventing re-use of a working product and encouraging more plastic crap to go to landfill.

Interesting to note that these are both premium brands. Are they relying on the majority of their customers being non tech savvy and unaware of the policy, or are they betting that most customers will accept the practice?

My guess is that they're assuming that revenue from customers forced to purchase a new, not secondhand product, exceeds revenue loss from those who are aware of the policy and won't purchase. Short term thinking, at best.