I mean, for your logic to hold up at all, it requires ignoring a very real fact. A second hand phone was already purchased. That transaction was done already, and there exists no world in which if you don't buy the second hand phone the seller will think "omg no one will buy this, guess I have to switch from Google forever". Another person will absolutely buy it. But even if not, then it gets wasted, and I think the environmental impact being ignored here is a pretty crass move also. I'm not willing to sacrifice environmental concerns to send a message to Google. Honestly they absolutely know how many phones are running stock android so that number decreasing would "send the message" just the same without a phone potentially ending up in a landfill.