Lots of us did "boycott" Microsoft when we chose not to buy Windows phones in the first place. I thought they were nice devices but, after the iPhone came along, followed by the explosion in Android devices, and between them they gobbled up all the market share, Microsoft were never a serious player in that market. The "entire fleet" of devices they ditched was a drop in the ocean from any perspective, including an ecological one: Apple, Samsung, and the like have a far bigger impact there.

I'm not saying you're wrong to want some support, or at least the ability to unlock - quite the opposite - but I find your reasoning a little faulty.